At a real computer for once...

That does look like a banjo bolt, probably not correct, or they attached the wrong image to the correct description...

Clip part number 51 33 8 254 781

RealOEM.com * BMW E53 X5 3.0i EL.FRONT DOOR WINDOW LIFTING MECHANISM

Parts number 5, 6, and 7 are the ones your looking for...
You shouldn't need to replace 5 or 6 unless they are missing, the clip breaks.