RealTruck carries a great selection of custom door sills your 1978 GMC Jimmy suv. Find a wide selection of door sills you need to upgrade your GMC sport utility vehicle. RealTruck carries stainless steel, billet aluminum, diamond plate, and illuminated door sills for your 1978 GMC Jimmy. 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.