I have just replaced the Hot Rod Air Evaporator unit in my 62 Corvette with one from Vintage Air. I believe Hot Rod Air is no longer in business so it might be difficult for others to get parts. If anyone wants the evaporator unit that I took out (it worked fine), including switches, air vents, etc. it's yours for free if you pay the cost to ship it to you. It's all located in Breckenridge CO.
Let me know. Hal