Welcome aboard Crystal. You may want to consider a Twisted Stitch Bench Seat...Probably around half the price of the rear seat, but then, tack on a couple hundred for proper 4 point harnesses and the price starts to creep up again. The bench seat would be fine if the two passengers are small children, two adults and a child in the middle make for some cramped riding. Twisted Stitch also make a matching booster seat, which I plan on getting as well. IMHO, the rear seating puts too much unwanted weight rearward, which may result in undesirable handling characteristics for your RZR.
Here's a photo of mine: