Ugh yeah that's a bummer, the old piston I think was a mahle and it was the best part of the kit.
I think I'll buy a os genuine piston just to put on the shelf either way, they are cheaper for some reason. I just didn't want to take it right to the overbore since it don't need it, and I don't even remember if mk65 are that good or if it was just like so easy to tune that we all blasted without knowing any better back in 2006. Maybe I should just leave it on the shelf and bask in the nostalgia....