meh, i put a .05 mm shim beneath each race, but i dont think it matters. that said i also used the teflon gasket on the crank case and i think that thickness is different than what you mentioned, but i cant recall my exact measurements
also you are probably right on the aftermarket cranks, do some forum searching I believe several MA za50 builders have commented in detail about where a certain cir clip sits in relations to some of the clutches.