In need of a stock bore 502 Diamond Racing Piston for my 500HP. current part number from diamond is 70075. the numbers stamped on my piston are 14103A, and 12701 there is also a cast number underside DRP75. Blew a head gasket and detonation damaged one piston, just tying to throw her back together. 724 four four 8 seventy five 0 2 is my cell or markgatto@gmail