I have a question about the factory air conditioning system. Will the dash controls from a 1970 -1972 dart or duster fit in the dash of a 1973-1974 duster/dart? Heater boxes interchange as well? I was given information on a 1973 dart but no ac and I found a couple of earlier A bodies that have ac and are cheap enough because they are pretty much part cars. With winter time approaching switching from a non factory system to a factory air conditioner system would be a good idea. Also, by chance does anyone know if the ac lines are available or would they have to be made?