OER Parts offers a wide selection of Body Panels for your 1958 GMC 100. OER Parts offers 1958 GMC 100 Cowl Panels, 1958 GMC 100 Cowl Drain Flap, 1958 GMC 100 Side Cowl Panel, 1958 GMC 100 Cowl Panel Plugs , 1958 GMC 100 Cowl Drain Hose, and 1958 GMC 100 Cowl Gasket.