OER Parts offers a wide selection of Cooling System Components for your 1966 Pontiac GTO. OER Parts offers 1966 Pontiac GTO Molded Radiator Hoses, 1966 Pontiac GTO Upper Radiator Hoses, 1966 Pontiac GTO Lower Radiator Hose, 1966 Pontiac GTO Water Pump Bypass Hose, 1966 Pontiac GTO Oil Cooler to Radiator Hose, 1966 Pontiac GTO Throttle Body to Radiator Coolant Hose, and 1966 Pontiac GTO Universal Engine Coolant Plumbing Set.