Shop 1999-2006 GMC Sierra 1500 running boards for compatible Regular Cab and Extended Cab trucks by matching the exact model year, cab configuration, product dimensions, and mounting application shown on the individual product page. Cab styles can require different board lengths and brackets, so do not choose by vehicle name alone.
Shop GMC Sierra 1500 by Generation
Shop GMC Sierra 1500 by Cab
Shop GMC Sierra 1500 by Step Width or Style
These links are shopping navigation, not interchangeable fitment guarantees. Confirm exact model year, cab, mounting configuration, included brackets, and product-specific exclusions. The separate 2027 collection does not establish 2027 fitment; use only product listings explicitly covering 2027.
For other Sierra series and generations, visit GMC Sierra Parts & Accessories.
1999-2006 GMC Sierra 1500 Running Boards FAQ
Will every product on this page fit every 1999-2006 Sierra 1500?
No. Exact fitment depends on model year, cab configuration, mounting application, and product design. Use the individual product page as the controlling fitment source.
Do Regular Cab and Extended Cab running boards interchange?
Do not assume so. Cab length can change board length, bracket position, and mounting points. Choose a listing that specifically names the truck’s cab configuration.
How should I compare 5-inch and 6-inch running boards?
Match fitment first, then compare stepping surface, profile, dimensions, finish, and product-specific construction details. Width alone does not determine compatibility.
What should I verify before installation?
Check the exact year and cab, mounting application, included brackets or hardware, package contents, and installation notes. Do not assume drilling requirements or factory mounting-point use unless the product page states it.
Aftermarket trademark disclaimer: People Auto Parts is not affiliated with, sponsored by, or endorsed by General Motors. GMC, Sierra, Sierra 1500, 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.
