Yes, they're 4 piston. These are the calipers:
http://www.wilwood.com/Calipers/Cali...temno=120-6806
http://www.wilwood.com/Images/Calipe...ynalite-lg.jpg
I dont know the diameter of the discs off hand but I'll try to measure them tomorrow.
EDIT:
Actually after a little research, I believe these are the rotors:
R/H: http://www.wilwood.com/Rotors/RotorP...temno=160-9249
L/H: http://www.wilwood.com/Rotors/RotorP...temno=160-9250
http://www.wilwood.com/Images/ROTORS...or-6blt-lg.jpg