OER Parts offers a wide selection of Fuel Doors & Hardware for your 1977 Buick Century. OER Parts offers 1977 Buick Century Fuel Filler Neck Pocket Sleeve, 1977 Buick Century Fuel Filler Door, 1977 Buick Century Plastic Fuel Tank Filler Door, 1977 Buick Century Rear Fuel Door with Spring, 1977 Buick Century Fuel Filler Door Bumper, 1977 Buick Century Fuel Door Emblem, 1977 Buick Century Locking Billet Fuel Door, 1977 Buick Century Fuel Filler Door Tension Spring and 1977 Buick Century Fuel Door Lock.