That sounds like a stock casting number. I think the guy at the swap meet knew they were junk. I think you have been sexually assaulted. There are only 2 Chrysler stand set ups that I'm aware of. Stock and 2". I don't know the casting numbers on the 2" gear. Chrysler part numbers and casting numbers are sometimes different. The 2/4 2" stand is a Chrysler part number P3614099 but the casting number could be different. I have no idea what is going on with yours.