The heater box includes all the AC components as the unit and controls are all integrated into one package?
If this is what you wanting to put your car back to stock, I have a complete unit that I just carefully removed from a very low mileage 1986 GN, under 5k miles.
This includes all the under hood components including the AC lines, and all the dash components including ducts, controls, wiring and vacuum harness.
Let me know if you are interested in this entire package as I do not want to separate these parts since is is a very complete package.