Sounds like you have really done some research. I don't have part #'s but I had a couple of mounts lying around from E-3's and E-12's and knew they were the same as my 80 633. All are std. US spec cars. I wish I had known about that P/N, I assumed the E-28 based 6's used the same as the E-28's I had seen. And I put a lot of time into that mount. Oh well, learn something new every day.(hopefully!) Mike W.