OER Parts offers a wide selection of Body Components for your 1978 GMC All Models. OER Parts offers 1978 GMC All Models Bumper Brackets, 1978 GMC All Models Filler Panels 1978 GMC All Models Guards & Bumperettes, 1978 GMC All Models Hardware, 1978 GMC All Models Impact Bar & Absorber, 1978 GMC All Models License Plate Brackets, Hardware & Frames 1978 GMC All Models License Plate Panel, 1978 GMC All Models License Plates, and 1978 GMC All Models Seals.