I had some good leaks that were masked by the plastic trim. Fortunately I had it removed, saw water drips, then searched here, problems solved. I just ran a thin bead of black water proof RTV silicone around the gasket which had squished out of alignment OEM in two areas at the bottom and in one long area on the top. The studs to the wing were starting to rust. I sealed those up as well. Water was dripping from most of the nuts under this spoiler mount plate. crazy.



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Here's the top of the plate



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Here's the wing



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