Front brakes
2006 WRX Limited calipers (4 piston) & pads / rotors
Rear brakes
up to 2000 Forester S NA (single piston) & pads / rotors
Radiator
5spd - 99-00 Forester
auto - 2 options
1. 99-00 Forester stock rad (have to cut two notches out of trans cooler heat shield and re route the hoses). mods req
2. 05-06 Forester S Turbo (need spacers for top mounts as 05/06 rad is slightly taller
Recommendation is don't do the 99/00 rad swap. Took far too long and modding to make it work. The 05/06 turbo is easier drop in.
5spd's don't need the oil cooler so either rad works.
This goes for the STB's as well.