Just for your interrest, the BMW K750, K1000, F650, Yamaha XS750, XS850, XS1100 bike engine share the same 29 mm shim size if your Kawa dealer fail. Here is a full list of bikes sharing the same shim 29mm size and range.
Honda
CB750C Custom - 1980-1982
CB750F Super Sport - 1979-1982
CB750K - 1979-1982
CB750L LTD - 1979
CB750SC Nighthawk - 1982-1983
CB900C Custom - 1980-1982
CB900F Super Sport - 1981-1982
CB1000C Custom - 1983
CB1100F Super Sport - 1983
CBX1047cc - 1979-1982
Pretty sure those Hondas use 25mm shims. (at least, the two I have do