1973 Mustang AC/Heater Wiring w/original tag.  This wiring is in very nice shape without any cuts or splices.  It connects the Heater Plenum box with the main wiring loom (Heater only assemblies have different wiring).   This wiring came out of a 73 Mustang with Air Conditioning (71-72 Mustangs have different wiring harnesses also).    If you are missing your 73 AC/Heater Plenum box wiring, then this is for you!!!