OER Parts offers a wide selection of Body Components for your 1978 GMC Truck Convertible. OER Parts offers 1978 GMC Truck Cables, 1978 GMC Truck Convertible Tops 1978 GMC Truck Moldings, 1978 GMC Truck Rear Window, 1978 GMC Truck Roll Bar & Light Bar, 1978 GMC Truck Tonneau Cover, 1978 GMC Truck Boots, 1978 GMC Truck Top Care, 1978 GMC Truck Top Frames, 1978 GMC Truck Top Latches, 1978 GMC Truck Motors & Hardware and 1978 GMC Truck Weatherstrip.