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Message: [QUOTE="tonto, post: 664969, member: 46712"] im not positive but i roughly measured the piston at 68.6562mm, which would leave me to beleive its the stock 69mm bore, as far if its an oem piston i dont know of any identifying marks or anything to tell. On the top of the piston theres a B, and an arrow, on the remaining inside of the piston theres a number 2, and what looks like used to be kind of a star that might of said OK in it but i have no idea. [/QUOTE]