OER Parts offers a wide selection of Heater Parts for your 1976 Buick Century. OER Parts offers 1976 Buick Century Expansion Valve, 1976 Buick Century Hose Clamps, 1976 Buick Century Hose Fittings, 1976 Buick Century Hoses and Lines, 1976 Buick Century Vent and Duct Parts.