'86 420: Rear window not working - plastic "sliding jaw" was broken. Ordered a new one but can't figure out how to install it. The metal button on the regulator arm does not seem to fit into the sliding jaw. There is a brass-colored metal piece in the new part, I didn't notice in the broken sliding jaw. Even if I removed the metal piece, the metal button the regulator arm would not fit into the hole in the plastic sliding jaw - too small in diameter. Could it be that the old metal piece is in the regulator arm? If so, it doesn't look like the brass colored piece in the new part. Following is a picture of the piece I ordered:
http://catalog.eautopartscatalog.com/tayco/image.jsp?title=Window%20Regulator%20Kit&url=http%3A//img.eautopartscatalog.com/live/O304116660FEB.JPG