SuperATV - POLARIS RZR XP 4 TURBO REAR SEAT CONVERSION KITGet More Cargo Space You use a four seater RZR for the extra storage space and longer wheelbase, not the extra seats. Instead of cramming your cargo in the back seat where it can damage your floorboard, install SuperATVs Polaris RZR XP 4 Turbo Rear Seat Conversion Kit. The UHMW panels in this kit give you a flat, solid place to store tools, tires, supplies, and anything else you need. It also makes one heck of a dog seat your pooch will appreciate.