Hey guys if this helps , I just bought a 2002 x5 4.4 and the rattle in the cargo area drove me crazy, so I had my brother drive with me lying down in the back . I pressed all the plastic panels in the cargo area that were around the window and the noise didnt stop, but when I pressed outward on the window the rattle stopped. So its the rear window hitting all the panels that surround the the window. I fixed the noise once and for all by putting 1/4 inch window seal the foam stuff that sticks on one side on all all the edging of the plastic panels that would hit against the window. Do this by removing the panels its easier. Also I used rubber cement on all the clips that hold the plastic panels in place just to be sure . There ya go the infamous rattle was gone. I also adjusted the hatch knobs to make sure I got a tight fit when the hatch is shut. Any questions please ask......Good Luck