Browse RealTruck's wide selection of custom door sills for your GMC Sierra 3500 truck. Upgrading your GMC Sierra 3500's door sills is a great way to add unique style that is instantly noticed by anyone stepping into your pickup. RealTruck carries door sill plates in stainless steel, billet aluminum, diamond plate, and even illuminated. We also offer fast, free shipping, and customer service that is unmatched. Give us a call at 877-216-5446 if you have any questions.