50" RZR's don't have as big of a strength issue as XP's so frame mounts and control arms aren't going to be a problem unless you hit a tree or something bad like that.
I'm assuming you have a old school looking black shock IIRC? If so the best thing you can do to that machine is buy a quality set of aftermarket shocks and put them one, its a night and day difference. I'd suggest a good skid plate for the bottom cause all the factory skids on every machine are junk. Factory UTV makes a killer skid plate that we use and install all the time. Go out and beat the crap out of it and have a good time.
Oh and please put some harnesses in it and wear a helmet