Anybody have any idea where to find a head gasket for a Sheffield railcar engine? This is a 2 cylinder opposed, 4 stroke engine. The gasket is round, 6 bolts, copper clad, 5-3/8" inside diameter. The bolt circle is 6-1/2" diameter. Anybody making these? Thanks in advance! Best Regards; Jim Mackessy Camillus, New York, USA