New pistons for my 60' TR3A

[RBuckner@aol.com]

I am replacing the pistons for my 60' TR3A due to an exhaust valve seat
problem.  

I have removed the pistons and cleaned up the cylinders.  Now I need to get
the new pistons ordered and installed.  I know i need 83mm pistoms, but I
don't know how much oversized, if at all, I need.  

Where is the best place to get them?  Moss, The Roadster Factory or where?

Could use any help on this matter.

Thanks in advance

Randy
60' TR3A