Mine is a 4-piston Superlite setup. Technically, Wilwood doesn't offer kits for our cars - it's up to vendors to buy their calipers and assemble them into kits, including make the brackets for them that will fit our cars.
My kit happens to be from UUC Motorwerks, and is the four-wheel kit:
http://store.uucmotorwerks.com/super...5323-p532.aspx
This is the rear-only kit:
http://store.uucmotorwerks.com/super...5323-p486.aspx
These kits feature M3 rotors.