Wait guys, When I installed mine, that piece CAME OFF because the frame actually took it's place up top with an edge that went up and forward. I have that dirty light cover somep[alce in my closet... I don't think you need it.

Also, yes use double sided 3m outdoor adhesive foam take to adhere it to the car as an extra precaution, it works wonders and it hasn't let go since, and I live in OR, rain city.

Just my experience, and my car didn't come with it I got it from the dealer.

I think to install it COMPLETELY you must drill holes in your trunk lid and get a diff lock button for the little rubber grommet to fit over or else you have an empty(yet hardly noticable hole) like on my car.

I'll get a pic looking up from the licese plate at that when it stops F-ing raining outside.