51 gmc window question

[jimmyjeep]

I am rebuilding the doors on "Frankenbolt". I need to replace the side windows as they were in pieces down inside the door when I got her. I have found everything else I need to do the rebuild except for the bottom channel that runs along the bottom of the side window glass. I have searched Chevy Duty, Brothers, Ricos, you name it. Does anyone have info on where I can get these things and exactly what they are called? Your help is greatly appreciated. Thanks.
http://pg.photos.yahoo.com/ph/sharig...=/3fcd&.src=ph