If you are curious what comes with the AP Racing Sprint kit for your BRZ/FRS/86, here you go. I have to admit, I was skeptical because this thing is so expensive, but the parts and quality are top notch. Hard to beat saving 10lbs per corner as well.
Also, if you are running Hawk HPS brake pads, I did find the ones that fit the AP Racing kit (per their cross-reference on their website). Plus, they are only $80 bux for a front set.
Hawk HPS front brake pads for AP Racing Sprint kit (HB521F.800)
And here are the rear pads that would go in the stock rear calipers for a matching set.
Hawk HPS rear brake pads
[ame="https://www.youtube.com/watch?v=gOL2VIVSCbQ"]AP Racing Sprint kit unboxing - Big Brake Kit - YouTube[/ame]