OER Parts offers a wide selection of Car Care Products for your 1978 GMC Truck. OER Parts offers 1978 GMC Truck Cleaning Supplies, 1978 GMC Truck Waxes & Polish, 1978 GMC Truck Hard Carnauba Paste Wax , 1978 GMC Truck Clay Bar Lubricant And Spray Wax, 1978 GMC Truck OER® Clay Bar , 1978 GMC Truck DA Paint Sealant Plus Carnauba, 1978 GMC Truck Liquid Carnauba Butter Wet Wax Creme, 1978 GMC Truck Scratch & Swirl-Eraser, 1978 GMC Truck Metal Polish and Sealant, 1978 GMC Truck Headlight Restorer Professional Polish, 1978 GMC Truck Powerball Polish and more...