Vibrant Exhaust Manifold Flange for GM LT1/L98/LB9 SM Block (Dport) - Sold in PairsVibrant Performance has developed one of the largest offerings of Exhaust Manifold Flanges in the industry. All of our Exhaust Manifold Flanges have had their exhaust port size optimized for either standard wall round tubing or Schedule 10 weld fittings. This Part Fits: Year Make Model Submodel 1994 1996 Buick Commercial Chassis Base 1994 1995 Buick Roadmaster Base 1996 Buick Roadmaster Collector's Edition 1994 1995 Buick Roadmaster Estate Wagon 1996