I've found some instructions for adjusting the position of the front glass.
BMW Workshop Manuals-X Series E53 X5 3.0d (M57TU) OFFRD-3 RA Adjusting Glass Slide_tilt Sunroof Lid

I hope I find some time to do it this weekend

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2004 BMW X5 3.0d
Safirschwarz metallic / Black Dakota leather