Yeah the JM code threw me off a little as well as I've always thought the codes for 69 firebirds Rally II's were JO & JC or so I’ve been told. I've been on that site you mentioned before Jim but unfortunately it doesn’t mention anything about the code JM. I've always thought these were original wheels on my 69 bird but now I'm not that certain as I was contemplating selling them. But I really need to what the code JM is for. If anyone out there knows please let me know.