What piston would fit this?

[00.warrior350]

I can't find a piston with this sizing. Can someone please help?

 

[00.warrior350]

I can't find a piston with this sizing. Can someone please help?
View attachment 5893

Would a 83.5 mm piston work the same way?-

 

[00.warrior350]

Would a 83.5 mm piston work the same way?-

Found one

 

[PineyPower]

Glad to help!