MC21 frame arrived and first thing I tried to fit the MC28 ProArm, but no dice, pivot bolt size is different, also NC30 ProArm I have has yet another different size bolt, in between MC21 and 28

Steering yoke didn't fit either, stem too short, even the RC31 and CBR 600 ones I have didn't work because they are too short and steering stops are in wrong location.

Tank front mount does not work... looks like I will end up buying the entire bike piece by piece.