I had this problem. Thee side gears are a different size by 1/16 of an inch. Both Aussie Locker and Powertrax have two part numbers for a D35, you just have to order the one that "should" work and if it doesn't exchange it for the other one.
I'm not sure how to tell you what you have as I think any D35 can end up with a different carrier. I had an Aussie that didn't fit, so I bought a lock-right (that did) and sold the Aussie to another member, who installed it and it worked fine in his D35.
I ended up with a Lock-right 2311 (which is not the "common one" that is listed for the RBV D35....the common one is the 2310). The 2311 is the one listed for most Jeep applications. For whatever reason my truck got the carrier that has the smaller side hubs.
The Aussie I bought was listed for my year vehicle, but the locker did not work. However I am almost absolutely positive the other part number for Jeep rear D35's would have worked as a substitute.
Like I said, both companies have two part numbers for the D35...