Anyone have info on which other years of crank will fit in the 1990 kx80? A friend just called and said he needs some help looking for a crank and said 90' was the only year that came with that style of crank. Looked the FleaBay and everything is 91'+ and I', trying to price out what it would be to get a crank for him. Anyone know if they interchange with any other years? Thanks.