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 Bottles and Sprayers, 1978 GMC Truck Ketchup Top For 16 Oz. Bottle, 1978 GMC Truck Industrial Sprayer For 16 Or 32 Oz Bottle, 1978 GMC Truck Secret Formula 32 Oz HD Bottle & Sprayer, 1978 GMC Truck Industrial Grade Fire Hose Nozzle, 1978 GMC Truck Full Function 1.6 Quart Power Atomizer And Sprayer, and { year} Truck Pour Boy All Purpose Spout.