Offset shackles
Yep just fitted my Dr Diff ones and you hard against the rails so dont see how could gain any additional width
mine was an older kit from who I don't know , advertised at 3/4'' , seller said they would not work on his a body , I had to hammer the frame rail carefully to get the front hangars to line up with the holes , the offset rears "were 3/4'' , I had already ordered a Dana 60 Detroit locker , and disc brakes , with the spring seats set in 3/4'' , the Dana 60 fell into the seat holes perfectly .
This is on a 68 fastback , slightly hammered the inner fender wells in the spots that are (humped) lack of a better description , did stretch the front of the fender wells to the inner fender panel , before painting , keeping the exact stock curve and shape , running 295 60 d15`s on 8 1/2'' rims , been that way for 12ish yrs. or more , no rubbing , works well .
Oh yeah , the inner fender panels are rolled some .
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All parts are not the same , much like all A bodies aren't the same ...
would have to get on my other computer to post pics...