I have 2 complete early disco axles including diffs which will fit your series so long as it has LR axles (ie, not salisbury).
?150 for the lot, but you'll have to take the lot. Collect from Caputh, 10 miles north of Perth.
The cases could be salvaged but are rough. I'd say the diffs, cv's and shafts are ok.
Cheers, G