Been thinking about looking for a 20 over piston cheap on ebay. There is a date split for the part number.
The split is at date code 01060600/01060700 so it needs the early part. #499292
Found a new one on ebay free shipping for $33.50
A rod is part #494504 is over $40 so one may as well buy the $100 kit if getting more than the piston.