Thanks AJ! Hubs are 3-4 ones - no doubt as they are quite different than the 1-2 hubs. The depth (just the splined part that sits on the mainshaft) is exactly 20.00mm = 0.7874"
I only need a few thousands clearance so I don't think it matters where I take it off.
oh, the 3-4 synchro assembly is...