It is only a $3 part but is NLA and I really need new ones because the old ones didin't come out in a reusable state. The part is called "window mount plug" and is essentially a plastic plug with a Steel nut inside. The part sits on the outer side of the side window in the door. It secures the window with a couple of screws than are accessible once the door trim is off. Part # 928 537 281 04 (# 10 in the drawing 805-00 which is page 194 from the parts lis book). Anyone know a source for this nigly little but important part?

 

928 Intl. has a half price sale right now!