I knew it was a long shot but I just had to give it a try
I've got the datsun 411 one as found in the fairlady 1600 or 2000 and the 64-67 bluebird.
And what I was amazed as you mentioned, as it looks to have small axles which is weird for such a big centre. The carrier is alloy and the commodore one is twice as heavy in comparison. Its easier to do a hilux conversion or something similar like the ford or commodore but since this thing is the same width as my 1000 h145 I thought I could give it a try. Otherwise Ive mentioned the PG concept of a home made lsd. Has anyone else heard of the modified live centre with the springs and steel plates for a cheap alternative?? It might be worth it or might not. Ill ring around and see if I can track someone whos done it.