When I replaced mine a few weeks ago, I removed the mount that surrounded the old unit, held in place with 4 screws and slipped it over the new unit. They seem to come with standard mounting hole to make it easy for everyone. Then it just slipped in just like it was made for it. I in fact mounted mine where the cd changer went and installed the scan gauge in the upper hole. Circuit City could not supply a connector so I had to cut and splice, but that was really not a problem. Just used the wiring schematic to match up the wires. Think I only used I think 10 of the 13 wires which at first made me wonder but it worked out just fine.