See if you can get these as a kit with rings and stuff already. not entirely related, but my cr85 expert has a 105cc piston in it and i tried to order a replacement from wiseco and they said they dont make them and i have to custom order. But i went to a honda dealer and ordered the rebuild kit, and i got a forged 105cc piston, complete with pin, rings, and gaskets..
may not help at all but it may be your answer
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