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All makes: parts brands and official catalogs

Every maker sells factory parts under its own brand name, and most publish an official catalog where you can look up a part by VIN. This sheet lists them, with notes on how each one numbers its parts.

Reading a VIN

Vehicles sold in the United States since the 1981 model year carry a 17-character VIN under a federal standard. The letters I, O, and Q are not used, so they are not confused with 1 and 0. The VIN is printed at the base of the windshield on the driver side, on the driver door jamb label, and on the title and registration. Parts catalogs use it to decode the engine, transmission, and build details a model name alone does not show.

17-character VIN, by position
1–3World manufacturer identifier: country, maker, and often vehicle type4–8Vehicle descriptor: model line, body, engine, and restraint details, as each maker defines them9Check digit calculated from the other characters10Model year code11Assembly plant12–17Production sequence number

Makes, parts brands, and official catalogs

Links open the maker’s own site. Several of these sites run a bot check, so a page may ask you to confirm you are a person. Dealer counters can also look up the same numbers. Third-party dealer stores sell the same genuine parts, often at different prices, so compare the number, not the store name.

Maker and brandsFactory parts brandOfficial parts siteNotes
General MotorsChevrolet · GMC · Buick · CadillacGM Genuine Parts, ACDelcogmparts.comGM's site sells both lines. GM Genuine Parts are the factory parts; ACDelco is GM's own aftermarket brand, also sold at many parts stores.
FordFord · LincolnGenuine Ford, Motorcraftparts.ford.comFord's support pages describe parts.ford.com as its storefront for Genuine Ford and Motorcraft parts, with VIN lookup and diagrams. Orders are filled through a dealer you choose.
Stellantis (North America)Chrysler · Dodge · Jeep · Ram · Fiat · Alfa RomeoMoparstore.mopar.comMopar is the parts and accessories brand for the Stellantis North American lines. Mopar numbers are usually eight digits plus a two-letter suffix, and the suffix changes when the part is revised.
ToyotaToyotaToyota Genuine Parts, TRDautoparts.toyota.comTRD (Toyota Racing Development) performance parts are sold through the same official store.
LexusLexusLexus Genuine Partsparts.lexus.comToyota and Lexus part numbers are usually ten characters written as two groups of five.
HondaHonda · AcuraHonda Genuine Parts, Acura Genuine Partsgenuinehondaparts.honda.comAmerican Honda's genuine parts site covers both brands. Honda numbers are usually written in three groups, such as five digits, three characters, and three characters.
NissanNissan · InfinitiNissan Genuine Parts, NISMOparts.nissanusa.comNISMO is Nissan's motorsport and performance brand (nismo.com). Nissan numbers are usually two groups of five characters.
Hyundai Motor GroupHyundai · GenesisHyundai Genuine Parts (supplied by Hyundai Mobis)Hyundai parts pageHyundai USA's parts page sends owners to a local dealer rather than a single national store. Hyundai Mobis is the group's parts and service arm.
KiaKiaKia Genuine Partsparts.kia.comKia genuine parts are also supplied through Hyundai Mobis.
SubaruSubaruGenuine Subaru Partsparts.subaru.comSubaru Parts Online shows the catalog, then fills the order through a local Subaru retailer by ZIP code.
VolkswagenVolkswagenGenuine Volkswagen Partsparts.vw.comVolkswagen of America's online store sells parts, accessories, and branded gear with a VIN lookup.
MazdaMazdaGenuine Mazda Partsparts.mazdausa.comMazda Parts Online supports a VIN search and lists accessories by type.
Mercedes-BenzMercedes-BenzMercedes-Benz Genuine Parts, Genuine RemanufacturedMercedes-Benz parts pageMercedes-Benz USA describes a two-year limited parts warranty and a remanufactured parts program for engines, transmissions, starters, and more.
BMWBMWOriginal BMW Parts and Accessoriesshop.bmwusa.comThe official online shop focuses on accessories and lifestyle items; replacement parts are usually ordered through a BMW center.
TeslaTeslaTesla Genuine Partsparts.tesla.comTesla says anyone can browse its parts catalog, with part numbers, diagrams, and prices. Ordering needs a free Tesla account, and some security parts are limited to registered professionals.

Links checked November 2026.

How part numbers differ by maker

There is no single format across makers, which is one reason cross-references matter. Ford uses a three-part number: a prefix that usually encodes the vehicle and design period, a basic number that identifies the kind of part, and a suffix for the revision. Mopar numbers are typically eight digits with a two-letter suffix, and the suffix moves forward when the part is revised. Toyota, Lexus, and Nissan numbers are usually two groups of five characters. Honda and Acura numbers are usually three groups, where the middle group often relates to the model. GM numbers are often eight digits with no dashes. Mercedes-Benz and BMW use long numbers that encode the part group. When a part is superseded, the old number usually points to the new one in the maker’s catalog.

Aftermarket brands publish their own numbers and list the original numbers they replace. That interchange is what lets you compare a factory part with an aftermarket one on PartIndex or at a parts store. Read the find the right part guide for how to check a cross-reference before you buy.

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