I dont know if any of them are interchangeable. Most Jags are limited slips to begin with.
There are a few places that carry jag stuff. There is CWI in Washington state,
http://www.geocities.com/~concourswest/page9.html
And my favorite since he is a few blocks from my house is Hamilton Auto Ind. 818-787-9594. He has forgotten more about our rears than most people know.