Thanks for resurrecting this and thanks to "mam4.6" for the original fix! All of the corner screws on mine were very loose. It fixed about 95% of the buzz I've been experiencing on the overhead. There are still a few minor rattles left, but that's to be expected for an 11-year old car.

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2004 X5 3.0i
Born 02/04
Delivered 03/04