Shop 1999-2006 GMC Sierra 1500 Extended Cab running boards and step boards by matching the exact model year, Extended Cab configuration, and product application shown on the individual product page. Extended Cab products are not interchangeable with Crew Cab or Regular Cab applications.
Choose the Right Extended Cab Step
The live assortment includes 5-inch and 6-inch running boards plus 6-inch step-board designs in black and stainless finishes where listed. Confirm exact year and Extended Cab fitment first, then compare stepping surface, profile, dimensions, materials, brackets, package contents, and installation notes.
Fitment Check Before Ordering
- Confirm the truck is a 1999-2006 GMC Sierra 1500 Extended Cab and match the exact year on the product page.
- Do not substitute Regular Cab or Crew Cab products based on similar width or appearance.
- The verified Crew Cab architecture in this older generation is narrower at 2004-2006; do not infer 1999-2003 Crew Cab fitment from this Extended Cab page.
- Review dimensions, brackets or hardware, package contents, and installation notes for the exact product.
Related Sierra 1500 Collections
1999-2006 GMC Sierra 1500 Extended Cab FAQ
Will every product on this page fit every 1999-2006 Sierra 1500 Extended Cab?
No. Exact mounting application and product design still need to match the truck. Use the individual product page as the controlling fitment source before ordering.
Are Extended Cab boards interchangeable with Crew Cab or Regular Cab boards?
Do not assume so. Cab dimensions can change board length, brackets, mounting points, and step position. Choose a product that specifically names the Extended Cab configuration.
How should I compare 5-inch, 6-inch, and step-board designs?
Match fitment first, then compare stepping surface, profile, width, dimensions, material and finish details, and package contents. Width or finish alone does not determine compatibility.
What should I verify before installation?
Check the exact model year and Extended Cab 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 LLC. GMC, Sierra, Sierra 1500, GM, and related 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.
