53 Ignition parts are listed for the 1975 Fiat 131, in 9 part types, covering the 1.8L L4 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 1975 Fiat 131, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules. Most of the listed parts are Spark Plug (21 parts), Ignition Coil (16 parts) and Spark Plug Wire (6 parts). The other 6 part types cover the remaining 10 parts.
The 1975 Fiat 131 came with a single engine, the 1.8L L4, and every part is verified against it.
17 brands supply ignition parts for the 1975 Fiat 131, led by STANDARD MOTOR PRODUCTS (9 parts), NGK (8 parts) and WELLS (6 parts), plus 14 more brands. Quality grades include Standard Replacement, Copper / Nickel and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 1975 Fiat 131. 11 parts have it, including SPECTRA PREMIUM C632 (Ignition Coil) and BOSCH 7900 (Spark Plug). Each part number opens a page with every vehicle that part fits.
Ballast Resistor
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | RU10T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | RU10 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Ballast resistors.
2 Ballast Resistor parts for the 1975 Fiat 131 come from STANDARD MOTOR PRODUCTS.
The Economy section lists 1 option from STANDARD MOTOR PRODUCTS — the catalog's value-priced group. STANDARD MOTOR PRODUCTS RU10T is listed in this group.
In the Standard Replacement grade, STANDARD MOTOR PRODUCTS supplies 1 part: built to original-equipment specification. A representative part number is STANDARD MOTOR PRODUCTS RU10.
Listed part numbers: STANDARD MOTOR PRODUCTS RU10T and STANDARD MOTOR PRODUCTS RU10.
Distributor Cap
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 5D1122 | 🇺🇸 US 🇨🇦 CA | with Marelli Distributor # S147A | View on Amazon |
This table covers the Distributor caps. Typical signs include a leak at the neck, a cap that will not hold pressure, or a missing tether. Match the pressure rating or thread in the notes — radiator, reservoir and fuel caps are not interchangeable.
One part is listed for the 1975 Fiat 131 — WELLS 5D1122.
Distributor Rotor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS | DU313 | 🇺🇸 US 🇨🇦 CA | vendor # Ducellier | View on Amazon |
| WELLS | 4R1034 | 🇺🇸 US 🇨🇦 CA | with Ducellier Distributor | View on Amazon |
This table covers the Distributor rotors. Typical signs include shudder under braking, or a lip at the outer edge. Do not put new pads on a rotor that is below minimum thickness.
2 Distributor Rotor parts are listed for the 1975 Fiat 131, from STANDARD MOTOR PRODUCTS and WELLS.
This group includes STANDARD MOTOR PRODUCTS DU313 and WELLS 4R1034.
Ignition Breaker Points
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FACET | 14939 | 🇺🇸 US 🇨🇦 CA | Vendor: Marelli | View on Amazon |
| STANDARD MOTOR PRODUCTS | MA3465 | 🇺🇸 US 🇨🇦 CA | vendor # Marelli | View on Amazon |
| WELLS | 4P1049 | 🇺🇸 US 🇨🇦 CA | SedanMirafiori | View on Amazon |
This table covers the breaker points in a points-type distributor.
3 Ignition Breaker Points parts for the 1975 Fiat 131 come from 3 brands — FACET, STANDARD MOTOR PRODUCTS and WELLS.
Listed part numbers: FACET 14939, STANDARD MOTOR PRODUCTS MA3465 and WELLS 4P1049.
Ignition Coil
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| SPECTRA PREMIUM Popular | C632 | 🇺🇸 US 🇨🇦 CA | Packwith External Resistor | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular | UC15T | 🇺🇸 US 🇨🇦 CA | T-Series | View on Amazon |
| FVP | UC15F | 🇺🇸 US 🇨🇦 CA | Internal Resistor Coil | View on Amazon |
| HOLSTEIN | 2IGC0058 | 🇺🇸 US 🇨🇦 CA | with internal resistor | View on Amazon |
| HOLSTEIN | 2IGC0146 | 🇺🇸 US 🇨🇦 CA | with External Resistor | View on Amazon |
| SKP | SKUF3T | 🇺🇸 US 🇨🇦 CA | Fits Coil Packor with internal resistor | View on Amazon |
| SPECTRA PREMIUM | C654 | 🇺🇸 US 🇨🇦 CA | Internal Resistor Coil | View on Amazon |
| WAI GLOBAL | CUF3 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Popular | 48863 | 🇺🇸 US 🇨🇦 CA | Internal Resistor CoilConnections May be Eyelet or Spade | View on Amazon |
| STANDARD MOTOR PRODUCTS Popular | UC15 | 🇺🇸 US 🇨🇦 CA | Internal Resistor Coil | View on Amazon |
| BOSCH | 9220081083 | 🇺🇸 US 🇨🇦 CA | Sedan | View on Amazon |
| STANDARD MOTOR PRODUCTS | UF2 | 🇺🇸 US 🇨🇦 CA | with External Resistor | View on Amazon |
| UNITED MOTOR PRODUCTS | C2 | 🇺🇸 US 🇨🇦 CA | with External Resistor | View on Amazon |
| UNITED MOTOR PRODUCTS | C15 | 🇺🇸 US 🇨🇦 CA | Internal Resistor Coil | View on Amazon |
| WELLS | 5C1057 | 🇺🇸 US 🇨🇦 CA | Requires External Resistor: YES | View on Amazon |
| WELLS | 5C1019 | 🇺🇸 US 🇨🇦 CA | Used on most import products with 12 Volt system with Internal resistorUniversal 12 Volt Coil | View on Amazon |
This table covers the coils that fire each spark plug. Typical signs include a misfire that follows one cylinder, a snap in damp weather, or a coil that is swollen or cracked. Swap a suspect coil with a neighbor to confirm, then replace boots that tore on the way off.
16 Ignition Coil parts for the 1975 Fiat 131 come from 10 brands — STANDARD MOTOR PRODUCTS, SPECTRA PREMIUM, HOLSTEIN and 7 other brands. The "Popular" part is SPECTRA PREMIUM C632.
The Economy section: 8 options from SPECTRA PREMIUM, HOLSTEIN, STANDARD MOTOR PRODUCTS and 3 other brands. SPECTRA PREMIUM C632 is listed in this group.
Standard Replacement: 8 parts, from STANDARD MOTOR PRODUCTS, UNITED MOTOR PRODUCTS, WELLS and 2 other brands. A representative part number is NGK 48863.
Ignition Conversion Kit
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 1A4162 | 🇺🇸 US 🇨🇦 CA | Marelli Distributor # S144, S147, Lobe Sensor Module12 Volt | View on Amazon |
This table covers the Ignition Conversion kits.
One part is listed for the 1975 Fiat 131 — WELLS 1A4162.
Spark Plug
Summary: Notes include pre-set gaps of 0.024", 0.025", 0.03", 0.031", 0.032", 0.035", 0.036", 0.040", 0.041" and 0.044". Replacement brands in this table include NGK, CHAMPION and DENSO.
Copper / Nickel
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BOSCH Popular | 7900 | 🇺🇸 US 🇨🇦 CA | NickelPre-Set Gap: 0.031" | View on Amazon |
| CHAMPION Popular | 415 | 🇺🇸 US 🇨🇦 CA | Copper PlusPre-Set Gap: 0.032" | View on Amazon |
| NGK Popular | 4008 | 🇺🇸 US 🇨🇦 CA | StandardPre-Set Gap: 0.032" | View on Amazon |
| ACDELCO | R42XLS | 🇺🇸 US 🇨🇦 CA | ProfessionalConventional | View on Amazon |
| CHAMPION | 300 | 🇺🇸 US 🇨🇦 CA | Copper PlusPre-Set Gap: 0.032" | View on Amazon |
| CHAMPION | 4151 | 🇺🇸 US 🇨🇦 CA | Copper PlusClassification: Champion Copper Plus Small Engine | View on Amazon |
| DENSO | 3066 | 🇺🇸 US 🇨🇦 CA | U-Groove ConventionalHex Size: 20.6 mm | View on Amazon |
| NGK | 6427 | 🇺🇸 US 🇨🇦 CA | V-PowerPre-Set Gap: 0.032" | View on Amazon |
| NGK | 7131 | 🇺🇸 US 🇨🇦 CA | StandardPre-Set Gap: 0.036" | View on Amazon |
Double Platinum (lasts up to 3x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ACDELCO | 41804 | 🇺🇸 US 🇨🇦 CA | ProfessionalDouble Platinum | View on Amazon |
| CHAMPION | 7415 | 🇺🇸 US 🇨🇦 CA | Double Platinum PowerPre-Set Gap: 0.032" | View on Amazon |
Iridium (lasts up to 4x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Popular | 6637 | 🇺🇸 US 🇨🇦 CA | Iridium IXPre-Set Gap: 0.032" | View on Amazon |
| CHAMPION | 9804 | 🇺🇸 US 🇨🇦 CA | IridiumPre-Set Gap: 0.03" | View on Amazon |
| DENSO | 5306 | 🇺🇸 US 🇨🇦 CA | Iridium PowerHex Size: 20.6 mm | View on Amazon |
| DENSO | 4709 | 🇺🇸 US 🇨🇦 CA | Iridium TTSolid Terminal | View on Amazon |
| SKP | SP1041 | 🇺🇸 US 🇨🇦 CA | Tapered Ground Electrode with Platinum Chip | View on Amazon |
Platinum (lasts up to 2x longer than Copper / Nickel)
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Popular | 7084 | 🇺🇸 US 🇨🇦 CA | G-PowerPre-Set Gap: 0.040" | View on Amazon |
| ACDELCO | 4 | 🇺🇸 US 🇨🇦 CA | ProfessionalRapidfire | View on Amazon |
| BOSCH | 6737 | 🇺🇸 US 🇨🇦 CA | OE Fine Wire PlatinumPre-Set Gap: 0.035" | View on Amazon |
| DENSO | 4502 | 🇺🇸 US 🇨🇦 CA | Platinum TTSolid Terminal | View on Amazon |
| NGK | 6764 | 🇺🇸 US 🇨🇦 CA | Platinumuse Iridium #6637 | View on Amazon |
This table covers the spark plugs for this engine. Typical signs include misfire under load, rough idle, or a flashing check-engine light. Verify the gap even on pre-gapped plugs, and replace coil boots that come off a high-mileage engine.
21 Spark Plug parts are listed for the 1975 Fiat 131, from NGK, CHAMPION, DENSO and 3 other brands. BOSCH 7900 carries the "Popular" badge.
In the Copper / Nickel grade, CHAMPION, NGK, BOSCH and 2 other brands supply 9 parts: grouped under the catalog's "Copper / Nickel" designation — the notes column spells out what sets them apart. A representative part number is BOSCH 7900.
In the Double Platinum (lasts up to 3x longer than Copper / Nickel) grade, ACDELCO and CHAMPION supply 2 parts: grouped under the catalog's "Double Platinum (lasts up to 3x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is ACDELCO 41804.
The Iridium (lasts up to 4x longer than Copper / Nickel) section lists 5 options from DENSO, NGK, CHAMPION and 1 other brand — grouped under the catalog's "Iridium (lasts up to 4x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. NGK 6637 is listed in this group.
In the Platinum (lasts up to 2x longer than Copper / Nickel) grade, NGK, ACDELCO, BOSCH and 1 other brand supply 5 parts: grouped under the catalog's "Platinum (lasts up to 2x longer than Copper / Nickel)" designation — the notes column spells out what sets them apart. A representative part number is NGK 7084.
Spark Plug Non-Fouler
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 42004 | 🇺🇸 US 🇨🇦 CA | 14mm Gasket Seat Long Reach | View on Amazon |
This table covers the non-foulers that space a spark plug away from oil fouling.
This group shows a single part: DORMAN 42004.
Spark Plug Wire
Premium
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| NGK Popular | 54358 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
| UNITED MOTOR PRODUCTS Popular | 9403 | 🇺🇸 US 🇨🇦 CA | SetUnited-Packard | View on Amazon |
| STANDARD MOTOR PRODUCTS | 55436 | 🇺🇸 US 🇨🇦 CA | IntermotorSet | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| B&B | M439860 | 🇺🇸 US 🇨🇦 CA | Platinum Class Laser Mag | View on Amazon |
| STANDARD MOTOR PRODUCTS | 27402 | 🇺🇸 US 🇨🇦 CA | Pro SeriesSet | View on Amazon |
| WALKER PRODUCTS | 9241021 | 🇺🇸 US 🇨🇦 CA | Direct FitSet | View on Amazon |
This table covers the Spark Plug wires.
6 Spark Plug Wire parts for the 1975 Fiat 131 come from 5 brands — STANDARD MOTOR PRODUCTS, NGK, UNITED MOTOR PRODUCTS and 2 other brands. The "Popular" part is NGK 54358.
In the Premium grade, NGK, UNITED MOTOR PRODUCTS and STANDARD MOTOR PRODUCTS supply 3 parts: a step above OE specification in materials, tolerances or warranty terms. A representative part number is NGK 54358.
Standard Replacement: 3 parts, from B&B, STANDARD MOTOR PRODUCTS and WALKER PRODUCTS. A representative part number is B&B M439860.
This group includes NGK 54358, UNITED MOTOR PRODUCTS 9403 and STANDARD MOTOR PRODUCTS 55436 and the remaining parts above.
Buying Ignition Parts for a 1975 Fiat 131
On this vehicle, the ignition system delivers spark at the right moment — plugs, coils, wires, distributors and ignition modules.
- 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 plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Spark Plug and Ignition Coil .
Frequently Asked Questions
How many ignition parts fit the 1975 Fiat 131?
Our catalog currently lists 53 ignition parts for the 1975 Fiat 131 across 9 subcategories and 17 brands, covering the 1.8L L4 engine. Each part is matched to the engine(s) it fits.
What are the signs of ignition problems on a 1975 Fiat 131?
Common symptoms include misfires under load, rough idle, flashing check-engine light, or poor starting in damp weather. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What spark-plug gap is listed for the 1975 Fiat 131?
Notes on this page include pre-set gaps of 0.024", 0.025", 0.03", 0.031", 0.032", 0.035", 0.036", 0.040", 0.041" and 0.044". Still verify against spec — even “pre-gapped” plugs should be checked before they go in.
What should I replace at the same time?
Where labor overlaps, replace plugs and wires (or coil boots) as a set — one weak cylinder makes the whole set feel bad.
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 1975 Fiat 131 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 1975 Fiat 131?
Every part on this page is matched to the 1.8L L4 engine. Then gap matters even on “pre-gapped” plugs — verify against spec, and replace coil boots when they come off a high-mileage engine. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 1975 Fiat 131
Ignition Parts for Other Fiat 131 Years
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