I could write a thesis on Stern and cognitive dissonance from what I've read on this website.
If Stern doesn't want to be in the parts business, they should farm it out to someone who can make it profitable. Every service call/part request like this just takes away from their bottom line in time/resources. I'd buy an AC Delco node board.
FWIW, I found a technician here in MN who I'm hoping can help. Any other help is greatly appreciated.