Factory Accessories for the GMC Sierra 3500HD: A Practical List

Factory accessories get dismissed as the expensive option, and sometimes they are. But GM Accessories are engineered against the actual vehicle, they use the existing mounting points, and they do not void anything. Here is what is worth it on a 2020-2024 Sierra 3500HD.

Tonneau Covers

Hard folding, soft folding and roll-up covers, all sized to the exact bed length. Order it in the finish that matches your trim and it looks factory because it is.

Search Tonneau Covers for the Sierra 3500HD.

Assist Steps

Factory running boards, available in rectangular, oval, molded and power-retracting versions depending on trim. The fit is the whole argument here.

Search Assist Steps for the Sierra 3500HD.

Splash Guards

Molded front and rear guards that match the flare contour. This is one of the few accessories that pays for itself on resale.

Search Splash Guards for the Sierra 3500HD.

Bed Rails and Tie Downs

Cargo management hardware that uses the existing bed stake pockets. Universal versions exist and they are close, but close is where the rattles come from.

Search Bed Rails and Tie Downs for the Sierra 3500HD.

All-Weather Floor Liners

Deep-channel rubber liners molded to the exact floor pan, with the factory retention posts still doing their job. Universal versions exist and they are close, but close is where the rattles come from.

Search All-Weather Floor Liners for the Sierra 3500HD.

Trailering Hitch and Wiring

Factory receiver, ball mounts, 7-way harnesses and trailer brake controller components. This is one of the few accessories that pays for itself on resale.

Search Trailering Hitch and Wiring for the Sierra 3500HD.

A Note on Fitment

Accessories are more trim-sensitive than mechanical parts, not less. Bed length, wheelbase, roof content, ride height package and interior color code all change the number. Send us the VIN and we will confirm before anything ships.

Shops and fleets can set up wholesale pricing at gmpartsclub.com/wholesale. Everyone else can start at our GMC OEM parts catalog or search for Sierra 3500HD accessories.