On my car I have trial fitted an E36 diff and have moddified the chassis mounting points to suit. The E36 rear hubs have been modified ( a lot of work) and the upright design modified to suit. The hub mods require a lot of material removal with angle grinders than time in a lathe so the final design looksa bit like a standard Ford item.
I have a new e mail address
graemewebb@ymail.com contact me for more info.