OER Parts offers a wide selection of Heater Parts for your 1964 GMC 1000 Series. OER Parts offers 1964 GMC 1000 Series Expansion Valve, 1964 GMC 1000 Series Hose Clamps, 1964 GMC 1000 Series Hose Fittings, 1964 GMC 1000 Series Hoses and Lines, 1964 GMC 1000 Series Vent and Duct Parts.