I think I may have what you need ... Send me a PM with which harnesses you need and I'll compare with what I have and let you know ... I just redid most of the dash wiring in my car a few weeks ago (87 GN non-electronic AC) ...
John A, Turbohh
Thought I'd save us a bit of time and post up the pics of the parts I have ...I think it's pretty complete ... Asking $90 shipped to your door.
Let me know I have some or all of what you need. It's all GM except the fan speed selector switch is a NAPA item if I recall correctly.
John A, Turbohh