Cometic 8 x 12.3 x 12 x 17 Viton Valve Stem Seal - Positive Ring & Band - 16 PackNew age engine builds require new age valve stem seals and we have them! These viton steel body (VSB) seals are available for most applications ranging from automotive to off road dirt bikes. This Part Fits: Year Make Model Submodel 1973 1974,1976 Avanti II Base 1977 Buick Century Custom 1992 1993 Buick Commercial Chassis Base 1992 1993 Buick Roadmaster Base 1992 1993 Buick Roadmaster Estate Wagon 1992 1993 Buick Roadmaster Limited 1990 1992 Cadillac