Here's a tip, in case it is not common knowledge ...
I replaced just the window clip on my right rear window of my '01 3.0i a week or so ago - did it without removing the regulator or window.

I had replaced the left front regulator when I first got the car (also replacing window clips, bushings, screws, vapor barrier, door panel clips, etc. while I was in there) and bought spares of the small parts, just in case. So that window is fine.

A couple of weeks ago my right rear window fell down inside the door (I was not there, so don't know details). I expected problems again with the regulator clip, but it was fine. Turns out it was just the window clip that was bad. So I used one of my new spares along with a new bushing and replaced it without even loosening any other screws. Took just a few minutes.

BTW, that right rear window had the regulator replaced at the PO's dealer about 100k miles earlier, with no other records of work on it. What I found in there was that the window clip was cracked and held together with electrical tape -i.e., it was kludged rather than just replaced by whomever was the last one in there. The regulator, motor, and door panel clips were all excellent (e.g., only one door panel clip cracked when removing the door panel = fresh).

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2001 X5 3.0i, 203k miles, AT, owned since 2014