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I recently latched my passenger side seat belt to see if that helped. There seems to be some play in the shoulder adjustment but I can't really locate the noise. I had my wife drive and I was in the back seat attempting to locate the rattle and it seemed like the sound was bouncing off the hard surfaces and I couldn't figure out where it was coming from. At one point I thought it was the sunroof, I would open it up all the way and close it and it seemed to stop it at first but it's not anymore, probably a placebo effect. Can't wait to figure this out. I did just get my 24 RR this week but haven't driven it more than the 3 miles home so will be interesting to see if it has the same rattle.
