I've done some research into this, and I've discovered that the ST185, ST205, and SXA10 all use a 6.7" rear differential, and all have optional Torsens.

Now, the ST205 didn't come here, so that's a bit harder to find, the ST185 is still pretty rare, but might be able to find one from it. The SXA10 is of course the 1st generation RAV4.

So we'll see how it goes, but right now I'm thinking that I may try and get one for my black car. My plan had been for a long time to wait for the 4A-GZE when I put in a Supra rear end and get a Truetrac diff, but I might as well try to find one of these Torsens in the mean time IMO.

Just thought I'd share that.