Cometic Buick V6 Rear Main Seal Kit - 2 Piece2 piece rear main seal with side rail seals. Cometic Viton is a fluoroelastomer, or high end rubber. Top of the scale for heat resistance, chemical resistance, and durability. This Part Fits: Year Make Model Submodel 1975 1977,1980 1981 Buick Century Base 1975 1979,1984 1988 Buick Century Custom 1980 1981,1984 Buick Century Estate 1985 1988 Buick Century Estate Wagon 1978 1981,1984 1988 Buick Century Limited 1984 Buick Century Olympia Limited 1975