And, here is my summary...
Here's my gathering from reading this "sticky"
Parts from other models/years that fit our 5th gen
2004--->up Brembo FRONT caliper
2004--->STi Front Rotor
2008--->up Brembo REAR caliper
2008--->up rotors will need a kit. KNSbrakes sells them as of this post, but not sure if Fred beans sells them.
# These Brackets allow you to mount Gold Rear Brembo Caliper (04-07 STi) or Black Rear Brembo Caliper (07 Limited STi) or Red Rear 2 pot Caliper (06-07 WRX) on to your 2010 - Up - Subaru Legacy
Any 2004 STI wheel
2008-2012 WRX rotors and brake pads are direct fit according to RCE.
Checked 2011 Legacy 2.5i rotors and brake pads are same product number as the 2008 WRX so it looks like the 2008 and up WRX or 2011 Legacy rotors and pads