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ok so I did some measuring and the wrist pin is 17mm and the bore is 70mm. Now I am in need of ordering the proper pistons/rings and valve oil seals.
Let me know what you guys think is my best option.
Thanks

Since all valves are intact and no shrapnel, either they were replaced on number #3 or the hole in the piston is due to lean condition heating it up and cracking. Pods without rejetting over time can burn up a motor from running lean. I also suppose some one could have put the wrong reach spark plug in and it hit the piston. The pics actually don't look that bad to me except for the hole in #3 pisiton. Good luck. R

Looking over your pictures of the bad piston there is clearly less carbon on the crown compared to the other cylinders. That tells me it was lean and that's possibly what burned it up. Probelm with the carb or an air leak could do that.

You need to determine if the cylinders are still in tolerance before you buy pistons, that needs to be done with a bore guage. If its too loose then a hone and re-ring won't last. It Burnt a piston up, that cylinder needs to be inspected closely.