You must mean bushings because the mounts are steel and welded to the frame and don't wear out, if anything the mounts could rust out. My bushings are fine on my '97. If yours are cracked or crumbling then it's time to replace. OEM are fine, but 4crawler.com has them for sale too. Not sure if they are poly or rubber, but it sin't going to effect the ride much either way IMO.