replacing door window on 1972 dart?

went to install it and the felt/plastic strip that pins through the front edge of the glass fell apart. This is what acts as a guide on the front edge of the glass. Anyone know where to get these?Division Bar Liner 67-74 A Body & 66-70 B Body Pair

I am currently trying to solve the dilemma of getting the division bars on the window and into the channel without tearing the strip. Wondering how you got them in?