Okay, someone is selling a 14" Stoptech BBK locally with ST40/ST45 calipers. I think he has the non-track version ot the BBK though. My Z is an '03 track edition however. What would need to be done to make the Stoptech non-track brakes fit on the track edition Z? What is different about the kit? Mounting brackets? Can these be bought individually, and if so for how much and where?

I saw there is a different version sold for non-track vs track 350z's here...
http://www.jscspeed.com/350z/brakes/stoptech.htm

 

The 03-05 model uses the same brake kit whether its a track model or not. Its only on the 06+ that the designation becomes important as the non-track models of those years have significantly larger piston sizes and rotors.

You would not want to install the 06+ kit on a track model or an 03-05 car as the piston sizes are too large, leading to increased stopping distnaces and poor pedal feel. ABS and VDC systems woudl also not work efficiently.

You would also not want install the 03-05 model/track model brakes on an 06+ model as the piston sizes would be to small.