OER Parts offers a wide selection of Heater Parts for your 1966 Dodge W300 Series. OER Parts offers 1966 Dodge W300 Series Expansion Valve, 1966 Dodge W300 Series Hose Clamps, 1966 Dodge W300 Series Hose Fittings, 1966 Dodge W300 Series Hoses and Lines, 1966 Dodge W300 Series Vent and Duct Parts.