Rear Offset Part Differences
 

What parts are different and exactly by how much?
It looks like the trailing arms are the same.
The hubs are different. Anyone know how different? Say 21mm?
Stub Axles - same or different?
Exactly how much wider is the rear late offset versus the early offset?

TIA

Having done this on my 79 924 with 87 944 trailing arms.

The stub axles, e-brake parts, bearings and arms are the same. Only the rotors and hubs are different.

Yes it is about 21mm different.