I have no idea, they where on the car when I got it I can't remember if their four pistons or six pistons, I think the rotors are under 12.0 inch diameter. I replace the rears several years ago due to them being heat cracked a bunch so I can try and measure them. They are 11 1/4 O.D.
The car is in the trailer at the race track, I think it has the same size four piston calipers on both ends, dual calipers on the rear end. It stops fine so far, hoping to turn it up this year