Although the measurements of the bellows are not exactly like those of my rzr 900 S, I have been able to mount them, and for the moment they work.
The wide part of the bellows is a few millimeters larger than the original, and the narrow part a few mm narrower.
As for the clamps, I have mounted the ones I had, since they are tightened better in case of need with the wheel mounted.
The fat, well, abundant