ChargerX3 has given you good advice.

The Montero Sports (MS) w/16" wheels have 315mm rotors and twin piston calipers that bolt right on and are far more brake than our trucks would ever need. The only issue is they require 16" rims to clear the calipers, although it's been mentioned that some 15" steel rims have been made to fit with a bit of grinding:

https://expeditionportal.com/forum/t...pgrade.167611/

If you're interested in rear discs, I've a complete rear end out of a '97 MS that will bolt right up as well as net you a far more robust high pinion 9" diff, which can be swapped for a factory air locker, as well as military wrapped leaf springs:

http://www.mightyram50.net/vbulletin...Diff-amp-4-636