OER Parts offers a wide selection of Oil Cap for your 1971 GMC C15/C1500 Pickup. OER Parts offers 1971 GMC C15/C1500 Pickup Chrome Oil Caps, 1971 GMC C15/C1500 Pickup Deluxe Twist-On Oil Filler Cap, 1971 GMC C15/C1500 Pickup Chrome Twist-On Oil Caps, 1971 GMC C15/C1500 Pickup Chrome Push-in Oil Caps, 1971 GMC C15/C1500 Pickup Billet Oil Caps, 1971 GMC C15/C1500 Pickup Polished Aluminum Oil Caps, and 1971 GMC C15/C1500 Pickup Logo Oil Caps.