Gary is that green piece hard plastic? I think mine was the same way yours is. I looked but I can't find my pictures of the steering column.
I've taken another look, and tried to use a magnet on it, but that's difficult to do with so much metal so close to it. I do tend to think it might be plastic due to it's shiny look. Perhaps it was a stop/spacer used in the factory when they installed the coupler to the end of the shaft?
Oh and that key boss don't look right but I could be wrong. It seems that's a later model thing if I remember correctly.
Are you referring to the taller key boss? on the tilt column? I have both the restored tilt column, just purchased as 'original restored' from Gary's classics in Athens, TX.. and I also have an original tilt column of the late sixties era, both have the tall boss for the keylock, but my samples are limited, which is why I asked the question hoping someone with a known original tilt column in their 69 Camaro can respond...