Modern Quick Ship GM Parts shows one in stock. It's part number 1515466. They're phone number is (800) 722-4828. They seem to have a mix of NOS and aftermarket stuff, so ask plenty of questions when you call. I have one of these NOS units for my burb, so if you need any dimensions if you're going to fabricate/modify one to make work, I'll be more han happy to to supply them. If they don't have what you need, check Ebay. I saw an NOS one last month, and they pop up there from time to time.
