Steering columns

[69SCSS]

I have kind of a hodge-podge of different year parts in my truck just because of it being a literal basket case, so I wanted to find out for sure what year column I have. What are the differences between the years? From what I have found, for the non-tilts there is a 67-68 version and a 69-72 version. I think I have a later version because I had to extend my intermediate shaft to fit, and it was from a '70. The shift arms are different 67-68, 69-70, and 71-72 in the catalogs, which I gather is the length. I'm guessing that's the only difference?

So basically how do I ID my column so I know exactly what I have? Need to get some parts so I want to make sure I get the right stuff.