Yeah if you fill and paint over the original numbers they really don't look twice.
There is two FA50 wheels at work that belong to my mates FA50, ill check tomoro but i think they are around 20" wheels, with drum brake centres, im not sure about cub rims but i know they are bigger.
Well ill go grab some food, and start a thread, i also wouldnt mind going and seeing the chap about the second motor later on in the day.
Cheers, Cam.