I actaully bought a shell from a junk dealer in Oregon for about $250 including shipping to CT. Haven't put mine on yet though due to cold weather. There are basically two large bolts that hold it on and that's it. They're right about center with the edges of the trunk opening under the grey plastic lip. You can look from underneath as well. Once the bumper is removed, it slides back. There are two mounting brackets on the rear quarter panels that the bumper slides into to hold the sides against the body. It's real easy as long as you have a socket set and a wrench. If you're not in a rush, I may consider selling the shell to you as I am looking to unload my 850 due to far too many mechanical problems. It's a dark green one and would need to be sprayed.