A friend recently sold his Yamaha WR450F & sold his shims to me, which just happen to be 7.5mm in diameter, the same as for the early R1s & Exup 1000s, as well as similar engined bikes. These are from the USA but are a lot cheaper than from Yamaha. Wemoto also sell them individually
http://www.wemoto.com/bikes/yamaha/fzr_ ... m_2.00_mm/