The rear arb is 18 mm on the 4x4, 16 mm on the 2wd sapph.

Caliper carriers are the same for 4x4 and 2wd. Stub shafts I'm not sure, as the 2wd uses thicker driveshafts with 108 mm flanges in stead of the 100 mm of the 4x4. But I don't know if that is on both sides of the driveshafts, or only on the diff side.