Stihl MS 390 carnage - disassembly.

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New P/C ~0.002-0.0025". Double that and it's getting sloppy, much less and it may seize.
My P/C clearance and ring gaps seems good. The replacement cylinder has a "B" cast into it. Piston does not have any visible markings except a part number cast inside. Is there a way to know if it's the right Piston other than checking the clearance? (Sorry if this is a dumb question)
 
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