Glad you brought this up. I had the same question. Both sides flap around during/after a drive-thru carwash. It's easy enough to put them back in the channel, but worried one day they'll come off completely.

I was thinking of just putting a small dab of silicone or something underneath each, but wasn't sure that would hold or if that would affect water draining or something. Let us know if you find a solution.

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Silver 2006 BMW X5 3.0i Auto