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What is this piece on the roof of the vehicle?

19 October 2023
Hello all.
Hopefully you guys can help me identify this part. It's have a gap. I think the plastic piece is loose that's holding it. May need to take it apart and see If I can tighten it up bit versus replacing the whole thing. Any help is greatly appreciated. Thank you.


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There are 5 or so nuts on the underside of that center brake trim that can come loose. There was a service bulletin for the center brake lamp in some early cars. If the dealer doing the replacement did not use some thread locker on the nuts, they can come loose. I believe M5. Open the hatch, you will see them. Be careful not to over tighten. You will misshape the trim.