MC18 2/4j, MC18 5/6k, and MC21 cranks do differ. Which one/s are you looking to do?
I live in New Zealand and (unknowingly and simultaneously) have been slowly working towards a similar thing for the MC18 R5k / R6k.
See my post over at Diff'rent Strokers
I hope it is OK to have mentioned you (SiLikesGuiness) in my post. If you want your name removed just let me know.
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[color=#808080][size=9]Yes,.. I too know how to waste Time and Money,...