OER Parts offers a wide selection of Car Care Products for your 1981 GMC C2500. OER Parts offers 1981 GMC C2500 Cleaning Supplies, 1981 GMC C2500 Bottles and Sprayers, 1981 GMC C2500 Ketchup Top For 16 Oz. Bottle, 1981 GMC C2500 Industrial Sprayer For 16 Or 32 Oz Bottle, 1981 GMC C2500 Secret Formula 32 Oz HD Bottle & Sprayer, 1981 GMC C2500 Industrial Grade Fire Hose Nozzle, 1981 GMC C2500 Full Function 1.6 Quart Power Atomizer And Sprayer, and { year} C2500 Pour Boy All Purpose Spout.