I need to replace the piece that attaches the window to the Regulator. They are White pieces with Black tar to hold them to the Glass. Well one of the has been wallored out and needs replaced. I was told the only place to get them was from a salvage yard along with the Window. Is that true and what kind of a cost can I expect at the Salvage yrd? Will they let me buy the White pieces alone? Any info would be great!! Thanks