How many different camber bracket designs?

I thought they were all the same, shows you what I know.

The 68 bracket is PN3931805 and the 79 is 356932 (both PN's from the AIM).
 
I was aware that the bracket changed around '69 (lower roll center), but I had seen some auction ads mentioning '69-74 and '75-79 units. Outside of an updated part number, I was under the impression that there weren't any geometry changes between the '69 and the '79 units. Am I correct?

Thanks.
 
Not that I know of, they look the same to me. Have a 77 and 69 one and they're the same.
 
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