Parts & Accessories for the GM Duramax

General GM Duramax diesel parts and accessories — the catch-all for everything that doesn't fit a single system.

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Match parts & accessories to your engine

Accessories and body parts follow the truck platform, not the engine code — which is the one fitment rule that trips up Duramax owners who've learned to shop by engine.

Generation	What it means for this part
GMT800 (2001–2007 classic)	LB7, LLY, and LBZ trucks. The original Silverado/Sierra 2500HD and 3500 body.
GMT900 (2007.5–2014)	LMM and early LML trucks. A 2007 can be either GMT800 or GMT900 — check the body, not just the year.
K2XX (2015–2019 HD)	Late LML and L5P HD trucks.
T1XX (2020+)	The current-generation platform. For a late truck, confirm platform as well as year — the engine code won't tell you body fitment.

Before you buy

→ Match body, interior, and accessory parts to the platform; match engine parts to the engine code.
→ Cab configuration and bed length matter as much as the year for liners, covers, and steps.
→ When a listing only names a year range, cross-check it against your platform before ordering.

Not sure which engine you have? Decode it from the eighth digit of your VIN with the Duramax VIN & engine code decoder, or map your year and platform in the generations & fitment guide.

Find parts & accessories on eBay Motors

Used, OEM, and hard-to-find parts & accessories for the Duramax — live listings, prices set by the seller.

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New Amazon parts for this category are added daily. In the meantime, browse live listings on eBay Motors above.

Read before you buy: parts & accessories guides

Written for this exact system, generation by generation.

Generations & Fitment Guide

Every generation mapped to its years, engine code, and truck platform.

VIN & Engine Code Decoder

The eighth digit for the engine, the tenth for the model year, and the RPO sticker.

Maintenance Schedule & Parts Checklist

The service parts worth keeping on the shelf.

Parts that go with these

Filters & Maintenance Performance EGR & Cooling

Parts & Accessories: common questions

How do I tell which truck platform I have?

By body year: GMT800 covers the 2001–2007 classic trucks, GMT900 the 2007.5–2014 body, K2XX the 2015–2019 HDs, and T1XX the 2020-and-newer trucks. The 2007 model year is the confusing one — GM sold both the classic GMT800 body and the new GMT900 body that year.

Do accessories fit across Duramax generations?

Sometimes, but the rule is platform rather than engine. Two trucks with different engine codes can share a body and take the same floor liners or tonneau cover, while two trucks with the same engine on different platforms won't. Engine code drives injectors, turbos, pumps, and tuners; platform drives everything you can see.

Where should I buy hard-to-find or discontinued parts?

eBay Motors is the right marketplace for used, OEM, take-off, and discontinued pieces, and listing prices there are shown live by the seller. New consumables and current-production accessories are Amazon Automotive's strength. The rails above and below cover both.