I don't know about different versions, but I can tell you a few years ago I bought one from the Classic Center and it installed just as it should.
They are very helpful. I'm sure if you call them, they can measure either the ball or end that snaps over to help you determine if your car has the original part. (Or, of course you can call Buds Benz, and they will help you too since you bought the part from them.)