It comes with 3M double stick adhesive tape on the back side.
Installation is easy, just time consuming...also, MUCH easier if you remove the T-L housing & work with it in your lap while watching TV & enjoying your libation of choice.
I have Left Rear Brake light out. How do I remove the Tail-light Housing. I removed the two screws in the inside closest to the door, but their still seems to be something else holding it in. Clips maybe? Any help will be appreciated.