you use fj front rotors i am blanking on the years to get them off of im sure someone will chime in if not when i get in tomorrow i will post up what year the rotors come off of.
You use the fj rotors and then your stock calipers.
nimyad is correct early spindles are different
In late 1981 Toyota changed the design of the front knuckle and rotor. Early and late rotors are different and not interchangeable. In order to get you the correct part you look at the face of your existing rotor . The early rotors (1979 - 1981) had only the 6 holes for the wheel studs. Axles from 1982 - 1985 have 8 hole rotors, six for wheel studs along with two additional smaller holes.
You said the axle was out of a 79 i recommend if you can find a set of later spindles it will help out alot not saying you cant use the ones you have now but with the later ones you can use a vented rotor that is bigger allowing for more braking force
