So, I have a 1963 Chrysler 300. The heater switch and box all work except the three vacuum actuators on the box are junk, which explains why the PO had the incoming vacuum source disconnected (they leak). These are dual-port actuators, part 2277091. They don't seem reproduced, and the couple of NOS ones for sale I can't imagine are still any good with 60-year old rubber. I'm guessing some of the specialized rebuilders like Original Air might have the expertise to rebuild these if I'm willing to wait years and pay through the nose. Otherwise, I wonder if anyone has been able to shoehorn something else in there? There is part 04882286 for a Dodge Ram that seems like it COULD be made to fit with some hackery. The heater, blower, and temp switches all work even with no vacuum, so I don't really NEED these actuators. From what I can tell they only govern the doors that let you choose between regular, defrost, and "fresh air" action. But I hate having anything not working if I can help it.