RealTruck carries a great selection of custom door sills your 1991 GMC Suburban suv. Find a wide selection of door sills you need to trick out your GMC sport utility vehicle. RealTruck carries stainless steel, billet aluminum, diamond plate, and illuminated door sills for your 1991 GMC Suburban. We also offer free, fast shipping, and the best customer service you can find. Shop now or give us a call at 877-216-5446.