OER Parts offers a wide selection of Fuel Doors & Hardware for your 1981 Buick Century. OER Parts offers 1981 Buick Century Fuel Filler Neck Pocket Sleeve, 1981 Buick Century Fuel Filler Door, 1981 Buick Century Plastic Fuel Tank Filler Door, 1981 Buick Century Rear Fuel Door with Spring, 1981 Buick Century Fuel Filler Door Bumper, 1981 Buick Century Fuel Door Emblem, 1981 Buick Century Locking Billet Fuel Door, 1981 Buick Century Fuel Filler Door Tension Spring and 1981 Buick Century Fuel Door Lock.