I have a JL12W6 in my trunk and tail light did same thing until the piece broke off.
I had the box custom built and installed so not easy to just take out. It looks like it came from factory and still have trunk space. Since I couldnt take it out, i knew ford wouldnt replace the light, so I Bought the Raxiom Smoked Aero Tail Lights from AM. These do not have that piece that rattles. Looks great and cheaper than a new factory light. No more rattle.
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