[KTL]

Tom,

I agree with your guess. Would seem like they're a set of rods that could be used with a typical 74.4 or 76.4 crank and simple custom pistons like say for instance a JE FSR with 22mm pins to make the assembly lighter. The only thing custom about the pistons would be the pin size. Everything else could be original Porsche specs.

That set is going to be a bit old since the stamps on them would indicate their age. Newer Pauters have what looks like laser engraving on them.