Yellow rose, 73 up may have had a larger bolt for the front hanger.
I believe Mopar Performance springs use the larger bolt even when
used in 63-66 applications.
What about the OD of the front eye bushing??? IIRC (I'd have to look it up on the webs) the part number is the same for 67-75 A body. I have a queer size. Calvert had no idea. They wanted $125.00 to machine two bushing I made in an hour.