What is the difference between 67 & 68-69 a body steering column

That is true. I have just swapped full columns from one car to another. He is curious about the upper collar on the 3 years. I think the upper collars go back to 66. They used some leftover 66 parts on my 67
66 is the same shape, and will fit perfectly (as will 63-65 floor shift and pushbutton auto) but is made from stamped steel as opposed to the cast aluminum used from 67 on