BESTgasket is the world's premier manufacturer of gaskets for vintage and classic American cars and trucks. BEST Gasket exhaust manifold gasket set for 1955-1958 Dodge/Plymouth models using a 241ci, 260ci, 270ci, 315ci, or 325ci "POLY" V-8 engine. P/N 15028. BEST Gasket is the leading name in sealing performance in the restoration industry.