These came with my rover. The previous owner bought them to give himself a little more legroom. Unfortunately, I donít remember the brand or where he bought them. They are threaded all the way through for a secure fit. Iím a bit shorter than he was, so Iím more comfortable without. I used the bolts to put my seat back in, so I suspect existing hardware will work. If not, it should be a few cents at your local hardware store. Installation is a snap...just remove the existing bolts, slide in the risers and retighten the bolts.