Hello fellow "Vintage Left Kickers", I am in the midst of starting a restoration on a 1972 WR250 and am trying to find a source for a 0.5mm or 1.0mm over-bore piston kit. Vintco lists everything except the '72 WR250. Is there something special/different about this piston besides the stock bore being slightly different? My bike looks to have the stock bore(?) with a stamp on the top of the piston of "69,43". (I'll post some pictures in a little bit.) Can anyone educate me or steer me in the right direction on this? I'm hopeful that someone makes a piston so that I don't end up having to source a NOS over bore. Thanks in advance for your help.