Tilt vs non tilt auto column differences

[Hawssie]

I had a couple quick questions about steering columns. I am working on a 1970 C10 that is an auto without tilt. I am looking at some used tilts on EBAY that are from 67-72 trucks not vans but I have noted some differences from mine. Firstly mine has the flat plug but the 2 tilts I saw on EBAY are round. Also mine has a plastic lit up pointer that screws on and is illuminated with a wire that goes to one of the gauge cluster bulbs and somehow picks up light and shines it down on the column pointer. Both the tilts have a stamped metal pointer that I am not sure how it gets lit up. Is this correct? For one I cant see why they would have around style plug for the tilt and a flat one for the non tilt, or was a model year difference.