OER Parts offers a wide selection of Oil Cap for your 1973 GMC C35/C3500 Pickup. OER Parts offers 1973 GMC C35/C3500 Pickup Chrome Oil Caps, 1973 GMC C35/C3500 Pickup Deluxe Twist-On Oil Filler Cap, 1973 GMC C35/C3500 Pickup Chrome Twist-On Oil Caps, 1973 GMC C35/C3500 Pickup Chrome Push-in Oil Caps, 1973 GMC C35/C3500 Pickup Billet Oil Caps, 1973 GMC C35/C3500 Pickup Polished Aluminum Oil Caps, and 1973 GMC C35/C3500 Pickup Logo Oil Caps.