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Try forum member paulywannafly. He has a shop just north of N.Y.C. I bought a frame from him a couple of months ago and I had a look around his parts cache. I could just about guarantee that he would have an original heater control in there somewhere.
Paulywannafly was a help although i did locate a GM dealer that had just the vacuum switch module, felt way different than China aftermarket (Eklers) and worked the nuts.
That was a tough problem to work through. Bottom line is, Stick w GM products whenever possible.
Thanks for all your help and on to my next winter project,