175 Piston

[Rocket]

I have a 75 175 that I am restoring and the cylindar is a standard bore 63.5mm I was wondering if any body has a NOS 63.5 piston out there and I would like to know what the piston measures exactly.  My cylindar is measuring 2.5015 top and bottom.  I am hoping I can just install a new piston and not bore the cylindar.
thanks
Rocket