I found part numbers if that helps. The spring itself is 3575256 and the rubber bumper is 3575257. They are listed as 29 and 30 in the diagram. They used the same part well into the 1980's, so I might have to pick up a junkyard column just for those two small pieces.
I am converting a 72 Barracuda from column shift to floor shift. The only thing I think I am missing is this spring. Does anyone know where I can buy one or have one that I could purchase? Thanks in advance.