Partner chainsaw NOS piston identification question? what does it go to?

Wesspur
Rugged made
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aarongd

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I have a brand new NOS Partner Piston in the box that i am having trouble identifying. Original box has a PN of 341162. It is a closed window piston and measures in vicinity of 49.6-49.7 MM. Any idea what it goes to? Want to sell it but doesn't do me any good not know what it is for? thanks
 
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