On the E series transmission the factory viscous lsd has the bar in the diff and the open diff has a small circular openning. The aftermarket diffs for the E series also has the small circular hole opening in the diff.
The only lsd axle that will work aside from the factory one is the mr2's lsd axle stub.
You should ask around in mr2oc. Im positive the sw20 lsd axle stub works. You will need a shorter driverside axle. Chico race works sells a aw11 gze length axle.