So, for all interested in doing the evo 3 lsd conversion for 3 bolt VR4s (and if you have a 4 bolt with viscous), I have done a fair bit of detective work on this and I believe that these febest parts
http://www.ebay.com....6-/171863640353?
are correct for the application. I managed to luck out on ebay and scored a pair of evo 3 rear inner axle cups, and I will measure them and confirm with Febest if they are correct when they arrive. Keep your eye on this thread if you're interested.
Cheers all