And this guy makes the point that you have to answer:
Why would cash-strapped mid-70's Chrysler spend money engineering, and re-tooling for new spindles if what they had worked for the new applications?
Interchanges, by definition, work both ways, but if the A/E spindle wouldn't work on FMJ or B/R that should tell you something....
From the source that did it first, who actually chums around with Chrysler engineers, AND consistently turns out good tech:
http://www.moparaction.com/Tech/archive/disc-main.html