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2016 250xcf piston size

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Helping a buddy do a top end his 2016 250 xcf and want to order parts before we tear the bike apart. There are two piston sizes listed on the parts diagrams. Some people said look for casting numbers on the cylinder but there were none. There are a bunch of different marks on the back of the cylinder head though. Gft, 0, y, s, cx5, 15, 11 were all on the back of the head. If these number don’t mean anything where can I find the correct piston size?

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Marking is located on cylinder bore, next to hole where timing chain goes through.

Disassemble the bore, get it measured by dial gauge, after that choose correct piston size.

IMG_20200521_082739.jpg

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