Hello again, I am trying to determine if plymouth dusters were ever offered with glass run channels on the edges of the door glass like most models, or if they relied only on the glass guide in the center of the door and the cat whiskers at the top of the door to keep the glass in place. My '75 duster does not have glass run channels and I am trying to figure out if it is supposed to or not. If anyone has a diagram of some sort, that would be extremely helpful as well. Thanks!!