Unbelievable, I have found an as yet unknown diff at a local wreckers. I can't believe it, its the right stud pattern, as close to the same width as the shit-warner that its not going to matter, even then input coupling holes are the same. Its even has leaf spring mounts. The spring mounts are about 20mm too wide, but I think I can legitimately, semi-bodgy the mounts quite easily. I am picking it up next payday, will post picks then. Oh yeah, the nose of the diff is a bit longer, but I think the slip joint will cover that. I suspect its either a T series or F series.