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.
I have run across A body spring hangers with a smaller or a larger bolt. I would think that the diameter of the
bolt hole in the bushing and the size of the eye in the spring would be the only thing relevant to the bushing.
Sounds like a weird problem. One would think that the spring would accept a stock busing or a proprietary bushing
in an aftermarket spring.