Thanks for the suggestions. Yes the dealership parts department has done national parts searches for it and have come up empty. IIRC they are supposed to be able to put in the part number and it will come back with quantity and dealership location information. Searches have turned up nothing. Then they said GM was supposed to "send the harness specifications to a vendor to have one specially built". No word on that move yet either. Love the car but can't believe the lack of parts availability.Get the part number and ask your local dealership to search the other Buick dealerships for one in stock. If they won't do that for some reason, just do a nationwide search for Buick dealerships, ask for their parts dept, then ask if they have that part on hand. If that doesn't work, start searching online. When I needed a skid plate, I found it online from one of those gmparts.xxx websites, and it came in straight from Germany with Peugeot branding.
On a similar note, out of curiosity I put my vin in some website that identifies where your car was made, and it told me Germany. I'm guessing ALL the parts for our cars come from there.