Shop 6-inch running boards selected for the 1999-2006 GMC Sierra 1500 Extended Cab. Products are filtered by generation, 6-inch product classification, Extended Cab wording, and positive inventory. Confirm your exact model year and application on the product page before ordering.
Fitment first
Verify Sierra 1500, Extended Cab, and the exact supported years. Crew Cab, Regular Cab, and HD applications are different.
Related shopping paths
Buying guidance
Confirm fitment first, then compare material, finish, step shape, and styling. The individual product page controls exact application.
FAQs
Do all products fit every 1999-2006 Sierra 1500 Extended Cab?
Verify the individual product page because exact supported years and application notes can vary.
Can another cab configuration be substituted?
Do not assume so. Match the product page to your Extended Cab configuration.
Are these all 6-inch products?
The smart rules use the 6-inch catalog classification and exclude title-labeled 5-inch and 7-inch products. Confirm width on the product page.
What should I compare after fitment?
Compare finish, material, step surface, and appearance after the product page confirms your truck.
Aftermarket trademark disclaimer
GMC and Sierra are trademarks of their respective owners. People Auto Parts is not affiliated with or endorsed by the vehicle manufacturer. Brand names are used only to identify vehicle compatibility.
