OER Parts offers a wide selection of Valve Cover Hardware for your 1981 Buick Estate Wagon. OER Parts offers 1981 Buick Estate Wagon Valve Cover Bolt Sets, 1981 Buick Estate Wagon Valve Cover Retainer Tab Set, 1981 Buick Estate Wagon Valve Cover Elbow, 1981 Buick Estate Wagon Valve Cover Grommets, 1981 Buick Estate Wagon Logo Bolt Set, 1981 Buick Estate Wagon T-Bar Wing Nut Set, and 1981 Buick Estate Wagon Wing Nut Set.