The 1978 MG MGB has 92 electrical bulb & socket parts with verified fitment on this page — 11 part types and 5 brands, covering the 1.8L L4 engine. Each part includes a manufacturer part number and application notes.
On the 1978 MG MGB, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination. Most of the listed parts are Turn Signal Lamp Bulb (17 parts), Dome Light Bulb (11 parts) and License Plate Lamp Bulb (11 parts). The other 8 part types cover the remaining 53 parts.
Every part on this page is matched to the 1.8L L4 — the only engine offered in the 1978 MG MGB.
The most listed brands for 1978 MG MGB electrical bulb & socket parts are SYLVANIA (37 parts), WAGNER (29 parts) and HELLA (12 parts), plus 2 more brands. Quality grades include Standard Replacement, Extended Life and LED.
21 parts on this 1978 MG MGB page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including SYLVANIA 1157 (Brake Light Bulb) and SYLVANIA 6418SL (Dome Light Bulb). Click any part number to see every vehicle that part fits.
Back Up / Reverse Lamp Bulb
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 6418 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: SV8.5-8 | View on Amazon |
This table covers the bulbs in the reverse lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
One part is listed for the 1978 MG MGB — HELLA 6418.
Brake Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1157LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: BAY15D | View on Amazon |
| WAGNER | 1157LL | 🇺🇸 US 🇨🇦 CA | Long LifeDouble Contact Index Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1157ST | 🇺🇸 US 🇨🇦 CA | Silver StarCool White | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1157SL | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| SYLVANIA | 1157RSL | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| SYLVANIA | 1157LED | 🇺🇸 US 🇨🇦 CA | ZEVO | View on Amazon |
| WAGNER | 1157LEDW | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 1157 | 🇺🇸 US 🇨🇦 CA | Base Type: BAY15DWattage: 26.90 W | View on Amazon |
| WAGNER Popular | 1157 | 🇺🇸 US 🇨🇦 CA | Double Contact Index Base26.880 Watt | View on Amazon |
| HELLA | 1157 | 🇺🇸 US 🇨🇦 CA | Incandescent27/8W | View on Amazon |
This table covers the bulbs in the stop lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
10 Brake Light Bulb parts are listed for the 1978 MG MGB, from SYLVANIA, WAGNER and HELLA. SYLVANIA 1157 carries the "Popular" badge.
The Extended Life section lists 2 options from SYLVANIA and WAGNER — grouped under the catalog's "Extended Life" designation — the notes column spells out what sets them apart. SYLVANIA 1157LL is listed in this group.
The Extra Bright (improved visibility, but shorter life) section lists 1 option from SYLVANIA — grouped under the catalog's "Extra Bright (improved visibility, but shorter life)" designation — the notes column spells out what sets them apart. SYLVANIA 1157ST is listed in this group.
In the LED (instant-on, long life, energy-saving) grade, SYLVANIA and WAGNER supply 4 parts: grouped under the catalog's "LED (instant-on, long life, energy-saving)" designation — the notes column spells out what sets them apart. A representative part number is SYLVANIA 1157SL.
The Standard Replacement section lists 3 options from SYLVANIA, WAGNER and HELLA — built to original-equipment specification. SYLVANIA 1157 is listed in this group.
Dome Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | DE3423LL | 🇺🇸 US 🇨🇦 CA | Base Type: SVLong Life | View on Amazon |
| SYLVANIA | 6418LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: Festoon | View on Amazon |
| WAGNER | 11005LL | 🇺🇸 US 🇨🇦 CA | Long LifeSV8.5 Base | View on Amazon |
HID (intense white light)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | DE3423LL | 🇺🇸 US 🇨🇦 CA | Longer Life | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 6418SL | 🇺🇸 US 🇨🇦 CA | LEDCool White | View on Amazon |
| SYLVANIA | 6418LED | 🇺🇸 US 🇨🇦 CA | ZEVOCool White | View on Amazon |
| WAGNER | 6418WLED | 🇺🇸 US 🇨🇦 CA | LED1.16 Watt | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular | 6418 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: SV8.5-8 | View on Amazon |
| WAGNER Popular | 11005 | 🇺🇸 US 🇨🇦 CA | Bulb Type: T-4 Bulb 1/2 (13mm) DiameterSV8.5 Base | View on Amazon |
| SYLVANIA | 6418 | 🇺🇸 US 🇨🇦 CA | Base Type: SVWattage: 5.00 W | View on Amazon |
| WAGNER | 17136 | 🇺🇸 US 🇨🇦 CA | Medium Standard Miniature Lamp | View on Amazon |
This table covers the bulbs in the dome lamp. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
11 Dome Light Bulb parts are listed for the 1978 MG MGB, from SYLVANIA, WAGNER, PHILIPS and 1 other brand. SYLVANIA 6418SL carries the "Popular" badge.
The Extended Life section: 3 options from SYLVANIA and WAGNER. SYLVANIA DE3423LL is listed in this group.
The HID (intense white light) section lists 1 option from PHILIPS — grouped under the catalog's "HID (intense white light)" designation — the notes column spells out what sets them apart. PHILIPS DE3423LL is listed in this group.
LED (instant-on, long life, energy-saving): 3 parts, from SYLVANIA and WAGNER. A representative part number is SYLVANIA 6418SL.
The Standard Replacement section: 4 options from WAGNER, HELLA and SYLVANIA. HELLA 6418 is listed in this group.
Headlamp Bulb
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | H6024XV | 🇺🇸 US 🇨🇦 CA | Xtra VisionColor Temperature: 3200 KV | View on Amazon |
| SYLVANIA | H6024ST | 🇺🇸 US 🇨🇦 CA | Silver StarColor Temperature: 4000 KV | View on Amazon |
| WAGNER | H6024BL | 🇺🇸 US 🇨🇦 CA | Up To 20% More Light | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WAGNER Popular | H6024 | 🇺🇸 US 🇨🇦 CA | High Beam and Low BeamHalogen | View on Amazon |
| SYLVANIA | H6024 | 🇺🇸 US 🇨🇦 CA | Base Type: PAR56Wattage: 40.00 W | View on Amazon |
This table covers the bulbs that light the headlamps. Typical signs include a dark lamp, a flicker over bumps, or a bulb that keeps failing on one side. Avoid touching a halogen capsule. Repeated failure in one socket is usually the socket or ground, not the bulb.
5 Headlamp Bulb parts for the 1978 MG MGB come from 2 brands — SYLVANIA and WAGNER. The "Popular" part is WAGNER H6024.
Extra Bright (improved visibility, but shorter life): 3 parts, from SYLVANIA and WAGNER. A representative part number is SYLVANIA H6024XV.
Standard Replacement: 2 parts, from WAGNER and SYLVANIA. A representative part number is WAGNER H6024.
Listed part numbers: WAGNER H6024, SYLVANIA H6024XV and SYLVANIA H6024ST, plus the other parts above.
Headlamp Socket
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 85810 | 🇺🇸 US 🇨🇦 CA | 3-Wire/Terminal Seal Beam Lamp 4002 & 4005 Bulb | View on Amazon |
| DORMAN | 84790 | 🇺🇸 US 🇨🇦 CA | High Temperature Socket | View on Amazon |
| DORMAN | 645998 | 🇺🇸 US 🇨🇦 CA | Bulb 4000, 4652, 4656, 5006, 6014, 6015, 6024, 6052, 6054, or 9003High Temperature Harness | View on Amazon |
| DORMAN | 90801 | 🇺🇸 US 🇨🇦 CA | Ceramic SocketHigh/Low Beam | View on Amazon |
This table covers the sockets that hold a headlamp bulb in the housing. Typical signs include a flicker over bumps, melted plastic, or a bulb that will not stay seated. Dielectric grease on the contacts slows corrosion. Do not force a bulb into a heat-damaged socket.
4 Headlamp Socket parts for the 1978 MG MGB come from DORMAN.
Part numbers include DORMAN 85810, DORMAN 84790 and DORMAN 645998, among others listed above.
Instrument Panel Light Bulb
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1445 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1445LL | 🇺🇸 US 🇨🇦 CA | Base Type: BA9SLong Life | View on Amazon |
| SYLVANIA | 53LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: BA9 | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular | 3898 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: BA7S | View on Amazon |
| SYLVANIA Popular | 53 | 🇺🇸 US 🇨🇦 CA | Base Type: BA9Wattage: 1.70 W | View on Amazon |
| WAGNER | 1449 | 🇺🇸 US 🇨🇦 CA | Miniature Screw Base2.800 Watt | View on Amazon |
| WAGNER | 11009 | 🇺🇸 US 🇨🇦 CA | BA7S Base1.730 Watt | View on Amazon |
This table covers the replacement bulbs for the Instrument Panel Light. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
7 Instrument Panel Light Bulb parts are listed for the 1978 MG MGB, from SYLVANIA, WAGNER and HELLA. HELLA 3898 carries the "Popular" badge.
In the Economy grade, SYLVANIA supplies 1 part: the catalog's value-priced group. A representative part number is SYLVANIA 1445.
The Extended Life section: 2 options from SYLVANIA. SYLVANIA 1445LL is listed in this group.
The Standard Replacement section: 4 options from WAGNER, HELLA and SYLVANIA. HELLA 3898 is listed in this group.
Listed part numbers: HELLA 3898, SYLVANIA 1445 and SYLVANIA 1445LL, plus the other parts above.
License Plate Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | DE3423LL | 🇺🇸 US 🇨🇦 CA | Base Type: SVLong Life | View on Amazon |
| SYLVANIA | 6418LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: Festoon | View on Amazon |
| WAGNER | 1895LL | 🇺🇸 US 🇨🇦 CA | Long LifeMiniature Bayonet Base | View on Amazon |
| WAGNER | 11005LL | 🇺🇸 US 🇨🇦 CA | Long LifeSV8.5 Base | View on Amazon |
HID (intense white light)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | DE3423LL | 🇺🇸 US 🇨🇦 CA | Longer Life | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular | 6418 | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: SV8.5-8 | View on Amazon |
| PHILIPS Popular | 1895 | 🇺🇸 US 🇨🇦 CA | Fits Standardor with Bulb 1895 | View on Amazon |
| WAGNER Popular | 1895 | 🇺🇸 US 🇨🇦 CA | Miniature Bayonet Base3.780 Watt | View on Amazon |
| HELLA | 1895 | 🇺🇸 US 🇨🇦 CA | HalogenAverage Rated Life: 2000.0 HR | View on Amazon |
| SYLVANIA | 6418 | 🇺🇸 US 🇨🇦 CA | Base Type: SVWattage: 5.00 W | View on Amazon |
| WAGNER | 11005 | 🇺🇸 US 🇨🇦 CA | Bulb Type: T-4 Bulb 1/2 (13mm) DiameterSV8.5 Base | View on Amazon |
This table covers the bulbs that light the license plate. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
11 License Plate Lamp Bulb parts are listed for the 1978 MG MGB, from WAGNER, SYLVANIA, PHILIPS and 1 other brand. HELLA 6418 carries the "Popular" badge.
The Extended Life section: 4 options from SYLVANIA and WAGNER. SYLVANIA DE3423LL is listed in this group.
The HID (intense white light) section: 1 option from PHILIPS. PHILIPS DE3423LL is listed in this group.
The Standard Replacement section: 6 options from HELLA, WAGNER, PHILIPS and 1 other brand. HELLA 6418 is listed in this group.
Parking Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1157LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: BAY15D | View on Amazon |
| WAGNER | 1157LL | 🇺🇸 US 🇨🇦 CA | Long LifeDouble Contact Index Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1157ST | 🇺🇸 US 🇨🇦 CA | Silver StarCool White | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS | 1157WLED | 🇺🇸 US 🇨🇦 CA | Ultinon LEDWhite | View on Amazon |
| SYLVANIA | 1157SL | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| SYLVANIA | 1157LED | 🇺🇸 US 🇨🇦 CA | ZEVO | View on Amazon |
| WAGNER | 1157LEDW | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 1157 | 🇺🇸 US 🇨🇦 CA | Base Type: BAY15DWattage: 26.90 W | View on Amazon |
| WAGNER Popular | 1157 | 🇺🇸 US 🇨🇦 CA | Double Contact Index Base26.880 Watt | View on Amazon |
| HELLA | 1157 | 🇺🇸 US 🇨🇦 CA | Incandescent27/8W | View on Amazon |
This table covers the bulbs in the parking lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
10 Parking Lamp Bulb parts for the 1978 MG MGB come from 4 brands — SYLVANIA, WAGNER, PHILIPS and 1 other brand. The "Popular" part is SYLVANIA 1157.
Extended Life: 2 parts, from SYLVANIA and WAGNER. A representative part number is SYLVANIA 1157LL.
Extra Bright (improved visibility, but shorter life): 1 part, from SYLVANIA. A representative part number is SYLVANIA 1157ST.
The LED (instant-on, long life, energy-saving) section: 4 options from SYLVANIA, PHILIPS and WAGNER. PHILIPS 1157WLED is listed in this group.
Standard Replacement: 3 parts, from SYLVANIA, WAGNER and HELLA. A representative part number is SYLVANIA 1157.
Side Marker Light Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1895LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: BA9 | View on Amazon |
| WAGNER | 1895LL | 🇺🇸 US 🇨🇦 CA | Long LifeMiniature Bayonet Base | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| PHILIPS Popular | 1895 | 🇺🇸 US 🇨🇦 CA | Fits RearStandard | View on Amazon |
| WAGNER Popular | 1895 | 🇺🇸 US 🇨🇦 CA | Miniature Bayonet Base3.780 Watt | View on Amazon |
| HELLA | 1895 | 🇺🇸 US 🇨🇦 CA | HalogenAverage Rated Life: 2000.0 HR | View on Amazon |
| SYLVANIA | 1895 | 🇺🇸 US 🇨🇦 CA | Base Type: BA9Wattage: 3.80 W | View on Amazon |
This table covers the bulbs in the side-marker lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
6 Side Marker Light Bulb parts are listed for the 1978 MG MGB, from SYLVANIA, WAGNER, PHILIPS and 1 other brand. PHILIPS 1895 carries the "Popular" badge.
The Extended Life section: 2 options from SYLVANIA and WAGNER. SYLVANIA 1895LL is listed in this group.
The Standard Replacement section: 4 options from PHILIPS, WAGNER, HELLA and 1 other brand. PHILIPS 1895 is listed in this group.
Part numbers include PHILIPS 1895 and SYLVANIA 1895LL, among others listed above.
Tail Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1157LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: BAY15D | View on Amazon |
| WAGNER | 1157LL | 🇺🇸 US 🇨🇦 CA | Long LifeDouble Contact Index Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1157ST | 🇺🇸 US 🇨🇦 CA | Silver StarCool White | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 1157SMD | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| DORMAN | 1157WSMD | 🇺🇸 US 🇨🇦 CA | Bulb Type 1157 | View on Amazon |
| DORMAN | 1157WHP | 🇺🇸 US 🇨🇦 CA | Bulb Type 1157 | View on Amazon |
| WAGNER | 1157LEDW | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA Popular | 1157 | 🇺🇸 US 🇨🇦 CA | Base Type: BAY15DWattage: 26.90 W | View on Amazon |
| WAGNER Popular | 1157 | 🇺🇸 US 🇨🇦 CA | Double Contact Index Base26.880 Watt | View on Amazon |
| HELLA | 1157 | 🇺🇸 US 🇨🇦 CA | Incandescent27/8W | View on Amazon |
This table covers the bulbs in the tail lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
10 Tail Lamp Bulb parts for the 1978 MG MGB come from 4 brands — SYLVANIA, WAGNER, DORMAN and 1 other brand. The "Popular" part is SYLVANIA 1157.
Extended Life: 2 parts, from SYLVANIA and WAGNER. A representative part number is SYLVANIA 1157LL.
Extra Bright (improved visibility, but shorter life): 1 part, from SYLVANIA. A representative part number is SYLVANIA 1157ST.
The LED (instant-on, long life, energy-saving) section: 4 options from DORMAN and WAGNER. DORMAN 1157SMD is listed in this group.
Standard Replacement: 3 parts, from SYLVANIA, WAGNER and HELLA. A representative part number is SYLVANIA 1157.
Turn Signal Lamp Bulb
Extended Life
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA | 1156LL | 🇺🇸 US 🇨🇦 CA | IncandescentSocket Type Bulb: BA15S | View on Amazon |
| PHILIPS | 1156LL | 🇺🇸 US 🇨🇦 CA | Longer Life | View on Amazon |
| SYLVANIA | 1156LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: BA15S | View on Amazon |
| SYLVANIA | 1157LL | 🇺🇸 US 🇨🇦 CA | Long LifeBase Type: BAY15D | View on Amazon |
| WAGNER | 1157LL | 🇺🇸 US 🇨🇦 CA | Long LifeDouble Contact Index Base | View on Amazon |
| WAGNER | 1156LL | 🇺🇸 US 🇨🇦 CA | Long LifeSingle Contact Bayonet Base | View on Amazon |
Extra Bright (improved visibility, but shorter life)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SYLVANIA | 1157ST | 🇺🇸 US 🇨🇦 CA | Silver StarCool White | View on Amazon |
| SYLVANIA | 1156ST | 🇺🇸 US 🇨🇦 CA | Cool WhiteColor Temperature: 3200 KV | View on Amazon |
LED (instant-on, long life, energy-saving)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 1156WSMD | 🇺🇸 US 🇨🇦 CA | Bulb Type 11563.6 Watt | View on Amazon |
| WAGNER | 1157LEDW | 🇺🇸 US 🇨🇦 CA | LED | View on Amazon |
| WAGNER | 1156WLED | 🇺🇸 US 🇨🇦 CA | LEDWhite | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| HELLA Popular | 1156 | 🇺🇸 US 🇨🇦 CA | Brightness: 32.0 CPIncandescent | View on Amazon |
| SYLVANIA Popular | 1157 | 🇺🇸 US 🇨🇦 CA | Base Type: BAY15DWattage: 26.90 W | View on Amazon |
| WAGNER Popular | 1157 | 🇺🇸 US 🇨🇦 CA | Double Contact Index Base26.880 Watt | View on Amazon |
| WAGNER Popular | 1156 | 🇺🇸 US 🇨🇦 CA | Single Contact Bayonet Base26.880 Watt | View on Amazon |
| HELLA | 1157 | 🇺🇸 US 🇨🇦 CA | Incandescent27/8W | View on Amazon |
| SYLVANIA | 1156 | 🇺🇸 US 🇨🇦 CA | Base Type: BA15SWattage: 26.90 W | View on Amazon |
This table covers the bulbs in the turn-signal lamps. Typical signs include a dark lamp, flicker, or a bulb that keeps failing in one socket. If the same position keeps failing, replace the socket or repair the ground rather than chasing bulbs.
17 Turn Signal Lamp Bulb parts are listed for the 1978 MG MGB, from SYLVANIA, WAGNER, HELLA and 2 other brands. HELLA 1156 carries the "Popular" badge.
The Extended Life section: 6 options from SYLVANIA, WAGNER, HELLA and 1 other brand. HELLA 1156LL is listed in this group.
The Extra Bright (improved visibility, but shorter life) section: 2 options from SYLVANIA. SYLVANIA 1157ST is listed in this group.
LED (instant-on, long life, energy-saving): 3 parts, from WAGNER and DORMAN. A representative part number is DORMAN 1156WSMD.
The Standard Replacement section: 6 options from HELLA, SYLVANIA and WAGNER. HELLA 1156 is listed in this group.
Buying Electrical Bulb & Socket Parts for a 1978 MG MGB
On this vehicle, the bulb and socket system covers every bulb and socket on the vehicle, from headlamps to instrument-cluster illumination.
- Confirm you have the 1.8L L4 engine — every part on this page is matched to it.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Turn Signal Lamp Bulb and Dome Light Bulb .
Frequently Asked Questions
How many electrical bulb & socket parts fit the 1978 MG MGB?
Our catalog currently lists 92 electrical bulb & socket parts for the 1978 MG MGB across 11 subcategories and 5 brands, covering the 1.8L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical bulb & socket problems on a 1978 MG MGB?
Common symptoms include a lamp that flickers over bumps, melted or discolored socket plastic, or bulbs that keep failing early on one side. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace bulbs in pairs so both sides age together, and put a smear of dielectric grease on the new socket contacts.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 1978 MG MGB was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 1978 MG MGB?
Every part on this page is matched to the 1.8L L4 engine. Then repeated bulb failure in one position usually means a socket or ground problem, not bad bulbs — replace the socket rather than chase it. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1978 MG MGB
Electrical Bulb & Socket Parts for Other MG MGB Years
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