Vent window channel seal source?

Are you referring to the piece of chromed pot metal that the actual vent window glass sits in? If so, that is glass setting tape. Otherwise, the actual vent window gasket is available as a reproduction piece from Metro Rubber products. The mylar glass channel run for the the front door glass that slides up with the glass inside the stainless trim is available as a reproduction piece. Just need to know exactly which piece your looking for??