Some may know this or it may have been posted before but just a little FYI. Don't know what years are the same but mine is a 2010 rzr-s.
I found on another forum someone posted a part number for the rear wheel bearing and size. 40mm ID, 74mm OD, 40 mm wide. I have not verified this yet but maybe someone with an old can chime in.
With the info I had I was able to walk it thru a few websites and came up with this.
Same as Front wheel bearing as a 1999 Ford Escort, which can be purchased just about anywhere.
I'll post the actual bearing numbers soon as I can, have the written down.
Now for the fronts, working on it! Lol.