[Brightcolours]

I wonder which source you used for those diameters. I measured 43.6 mm for Fuji and 46.8 mm for Nikon outer diameter of the camera mount (which doesn't matter so much) and something like 40.6 (Fuji) and 43.4 (Nikon) at the lens' mount smallest diameter.

 

Fuji and Nikon don't share any of the diameters. 

So the Fuji X mount diameter mentioned in various places is wrong, too big. The rest I mentioned appear to be correct.