BESTgasket is the world's premier manufacturer of gaskets for vintage and classic American cars and trucks. BEST Gasket oil pan gasket set for 1953-1958 DeSoto, Dodge, and Plymouth models using a 241ci, 260ci, 270ci, 315ci, or 325ci "POLY" or "HEMI" V-8 engine. P/N 21010. BEST Gasket is the leading name in sealing performance in the restoration industry.