2 piston calipers? Why? Those are 1 ton truck sized brakes. Rear calipers really don't need to be that beefy man.The 80 calipers are the only option. I posted in the 80 section and got flamed, something about the way Toyota designed it being end all or something. I intend on finding a 2 piston caliper once I make sure I'm actually getting pressure to the rears (I'm not sure that I am right now)
The 80 rear calipers are 1-piston. I want to find a 2-piston. I have a funny feeling FJ40 front calipers might work back there.
Also note that the e-brake is separate from the calipers, it is drum-brake style inside the rotor with mini brake shoes.