Not sure about the JK diff but couple years ago I put a TJ 44 into my ZJ and used the ZJ discs. I had to get some deeper axle retainer's from the States to allow this. Only because the TJ didn't have disc's and the ZJ did. I also had to get all the mounting's changed obviously to fit it in there.
Best way is try matching your backing plate up and see if the holes match then the callipers too I guess. Ok, so long as you got spare and access to the diff housing.
Be following this for future.
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Modifications,what modifications? That's factory fitted..........
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