Hi RZ, in a previous post I showed how you covered up the rectangular hole in the backside of the coach body where the old taillights were. By using a piece of plexiglass. In my case, and the original person asking about replacing the taillights, we both had fiberglass Sunrader's. So I left the original holes in the sunrader body alone and bored the plexiglass cover plate holes a little larger than the screws . The new LED lights then fasten on to the plexiglass cover plate.
