Options for Wheels/tires for 2011 ranger 800 xp

My brother has asked me to help him find some wheels and tires for his ranger. I’m not a tire guy and it doesn’t take much for me to get confused with all this. I figured the wheels off a rzr or such would with no problem but I’ve also read they won’t.

Can someone help me out with exactly what I’m looking for or better yet if you know of a place with good prices you can point me to? He found some on eBay for I think 750 but he’s trying to find a better deal.

He wouldn’t mind going with 14s but I think the price difference will keep him with 12s.

I know some guys are really into wheels and such so I’m hoping someone knows of a good place to buy.