This is from the Eaton catalog
What i'm thinking is if we can get some measurements from either a standard diff ??OR if someone has bought a e locker and hasn't fitted it yet ??OR if someone has a good contact in a store that sells them can open one up and figure out what Harrop is retrofitting into the patrol diffs??. The second and third option is best that way we could even see if there is any casting markings or numbers that way it will help pinpoint it further!!
Cheers