Kendo, I used bathtub silicone to glue the light to the lip above the rear window. I think the silicone will keep it in place but be easily removable when I get the car repainted in the future. the 3rd. light is a inexpensive one I picked up at Princes Auto (Canadian equivalent of Harbour Freight). I sanded the top and bottom of the light flat to reduce the profile. It came with a chrome surround that I discarded.
Sandy