Back Up Light To Body Gaskets for 1967-1970 Mustangs.
Keep a nice seal with new gaskets so moisture can't penetrate your new lights. These gaskets are essential to replace when installing new back up light assembly's. They mount between the back up light body and the rear valance.
If you can see on the picture there is a notch in the seal where you can press the housing into. However, this does not work. The lips constantly fall off with 15 tries I quit and am just gonna return it.