After closer examination I notice that the one on the left has a notch down the side of the splines and the one on the right does not. Does this make a difference and if so which one will fit correctly on a 72 column.
One with Notch is for Cars
One without Notch is for Trucks
Car adapter will work on any car column but will only look correctly on a 70 and up column as the collars are physically bigger then 69 and down collars