What other ball diffs fit the PR Racing 2wd?

[zeno]

A friend got the PR Racing 2wd sports version last year and now want to change from gear to ball diff.
The problem is that we're on the only 1/10 dirt track that's left in Sweden and the shop that sells PR didn't bother to stock any dirt parts for that car.

But since ball diffs are available for other brands such as AE and Kyosho perhaps you guys know if any of those will fit?