I have seen these individually stamped rear ends as I have one myself. Jerry initially could not verify it to be original, but as more time passed and more were observed like mine in the same time frame, he did acknowledge my rear to be original. I knew the rear to be original since I knew the original owner and his family and the full history of the car (a ton of docs and history from new), and I was not selling the car, so while concerning initially, I just knew with more time and more discovery the truth would come out. I have now seen many examples from researching mine, I would assume the same will hold true for you as I think yours appears original imo. Just be patient and let the research catch up.
