OER Parts offers a wide selection of Oil Cap for your 1966 GMC Suburban. OER Parts offers 1966 GMC Suburban Chrome Oil Caps, 1966 GMC Suburban Deluxe Twist-On Oil Filler Cap, 1966 GMC Suburban Chrome Twist-On Oil Caps, 1966 GMC Suburban Chrome Push-in Oil Caps, 1966 GMC Suburban Billet Oil Caps, 1966 GMC Suburban Polished Aluminum Oil Caps, and 1966 GMC Suburban Logo Oil Caps.