I'm working on a 2001 CR125. My cylinder is marked "B" and the piston isn't stock so the mark isn't there (B AR1T060). I looked on a few websites and I can't figure out the deal. Can you use an A piston with a B cylinder??? I was told that the diameter is different and it won't work BUT Wiseco only makes one size???? I want a stock Honda piston anyway but everyone has an A and noone has a B. What can/can't I use and what is the difference between the two? Thanks!