So I took the plunge and bought a pair of Gen 2 steering hubs and rotors for my Gen 1 brake upgrade. And I can confirm to all that have and will ask this question - yes, the Gen 2 caliper bolt holes are the same distance apart and threads/bolts are the same but are 'clocked' on an angle compared to the Gen 1's. I wanted to go the full deal and use twin piston calipers from a Montero (Pajero in Oz) but I wasn't able to find any in the JY but I did make an unexpected discovery. I noticed a pair of twin pistons on a 1998-2000 4WD Mitsubishi Challenger and decided to try out the fitment on the Gen 2 steering hubs - and they bolted up perfectly. I think the calipers are intended for a bigger rotor but they'll work (unless I can find a rotor to match them). Added note - the Gen 1 and Gen 2 geometries are the same (215mm high from ball joint to ball joint - 135 mm from centre of the bottom ball joint hole to centre of the tie rod end hole)