I need the same rivet (gray) for my seatbelt. I went to the dealer and they told me I couldn't buy that part without buying a new belt assembly! The buckle has slid all the way down the belt and has gotten pinched between the seat and the door breaking the courtesy light lens on the drivers door! If anyone is parting a car and has one of these, please let me know.
I also need one of those soft (gray) screw covers that hide the door panel attachment screws.
