I am trying to find a replacement for the heater duct for my 58 CJ5. It is the main duct that leaves the heater under the dash (on the drivers side) and has a diverter for the defrost. About half the duct is made of cardboard with staples attaching it to the metal parts. The cardboard sections are in rough shape and I have restored all other parts of my heater. I thought about taking it to a place that does repairs to automotive seats etc........anybody have any ideas or know where this duct can be purchased from?