I did mine with a new Alpine unit and used the inside border of the installations slip housing as a template. Just place the plastic cover on the face of the radio bezel, mark your corner locations and dremel away. It was quite easy. Insert the stereo from the front and slide the slip housing on from the back, lock the tabs and go. I did not have to add any brackets on mine to hold it in place. I can send you some pics if you need me to. Just PM me. (by the way, it looks sweet; as if it was meant to be there from the beginning.)