Pretty sure the bell housings are the same...I think the only real difference between the 21r-c and a 22r is the bore size.
But if for some reason they did slightly change the gearbox bolt pattern,I have another W57 box in the parts corona anyway.

Good times ahead,I can't wait to finally get it on the road!
I had a guy look over it for me the other week....a pre inspection,inspection,lol....pointed out a few things that needed fixing/tidying up and I've pretty much got it sorted....once I drop the 22r in it should pass the road worthy without an issue!

I'll take some snaps when I start ripping into it......so until then!

Peace.