I have a stock 2010 rzr, stock tires. Installed the ROKTEK 3" lift. Purchased from Ebay. Very similar to yours. The brand name is well known on the forum. The seller will answer your phone calls, did it for me. No additional parts were needed. Width after install is 50". Did it by my self, wouldn't hurt to have help to hold stuff. Happy with lift, gained an actual 3", before and after measurements. Check the video under suspension on how to change shock springs. You will need to compress the springs to put in a spacer.