Shackle bushings

There are no side plates..spring goes straight into a bracket..car has no shackles for side plates..I saw the rock auto shackle for sale but didn't see front of spring bushings on the site..I have to investigate more for bushing sizes.

Ah, sorry.
I thought you were refering to the rear hangars.

The only real clue to size that I have every really seen was that OE slant 6 cars had the smaller bushing, and the V8's had the larger one.

I can tell you though, that when I had a parts house look them up they got the right size, so maybe that can help you determin which one it takes.