Dunno if this is any use as we never got 7 passenger or limo mopars after WW2 but if you don't have any window channels at all it maybe worth finding a 46-48 Dodge Parts Manual to at least be able to possibly see what you need or what could fit............ I'd also think that the window channels for the front doors from a standard length 4dr Sedan would be the same as the 7 passenger car, not sure about the rear doors but the channels should be the same basic design & operation and you maybe able to adapt the short rear door pieces to your longer rear doors..........the front window wing vents should be the same in all closed body cars, ie, 2,4 door and 7 passenger or Limo ..........1/4 vents, AFAIK have the glass held in with what I know as "setting tape" and any good glass shop should be able to fit the 1/4 vent glass........andyd