^Just 05/06 sedan brakes (maybe 06 coupe brakes, I can't remember)

They're dual piston and the rotor is about an inch larger.
07+ is a different brake design

 

05-06 sedan brakes(except for 05 X's), 05-07 coupe brakes or 05-08 350z brakes(possibly even the 09 350z roadster)

edit: or maybe just 05-06 z's not sure about that

if you go into the next gen G's or the 370z you will need modifications