Shop 2020-2027 GMC Sierra 3500HD Double Cab running boards and nerf bars by matching the exact model year, Double Cab configuration, and product application on the individual product page. Current live products reviewed for this collection are labeled through 2026, so this collection architecture does not establish 2027 SKU-level fitment.
2027 availability: This collection is reserved for confirmed 2027 GMC Sierra 3500HD Double Cab products. Compatible products can be added as verified inventory becomes available. Until then, use only an individual product page that explicitly lists 2027 before ordering.
Quick Fitment Check
- Confirm the truck is a GMC Sierra 3500HD Double Cab.
- Match the exact model year on the product page; some current listings stop at 2025 or 2026.
- Do not substitute Crew Cab or Regular Cab boards based on similar width, appearance, or finish.
- After fitment is confirmed, compare 5-inch, 6-inch, 7-inch, hex-step, wide-step, and drop-step designs only where the individual listing identifies that style.
- Review dimensions, brackets or hardware, package contents, exclusions, and installation notes before checkout.
Shop Related Sierra 3500HD Collections
2020-2027 GMC Sierra 3500HD Double Cab FAQ
Does every product on this page fit a 2027 Sierra 3500HD Double Cab?
No. Current reviewed products are labeled through 2026. For a 2027 truck, use only a product page that explicitly includes 2027.
Are Double Cab boards interchangeable with Crew Cab or Regular Cab boards?
Do not assume so. Cab dimensions can change board length, bracket position, mounting points, and step location. Choose a product specifically listed for Double Cab.
How should I compare different board widths and step styles?
Confirm exact fitment first, then compare the listed width, stepping surface, profile, dimensions, material, finish, and package contents.
What should I verify before installation?
Review exact supported years, Double Cab application, included hardware or brackets, dimensions, exclusions, package contents, and installation notes on the product page.
Aftermarket trademark disclaimer: People Auto Parts is not affiliated with, sponsored by, or endorsed by General Motors LLC. GMC, Sierra, Sierra 3500HD, GM, and related names and trademarks belong to their respective owners and are used only to identify compatible applications. Products are aftermarket parts unless an individual listing expressly states otherwise.
