OER Parts offers a wide selection of Body Panels for your 1984 GMC Truck. OER Parts offers 1984 GMC Truck Cowl Panels, 1984 GMC Truck Cowl Drain Flap, 1984 GMC Truck Side Cowl Panel, 1984 GMC Truck Cowl Panel Plugs , 1984 GMC Truck Cowl Drain Hose, and 1984 GMC Truck Cowl Gasket.