Not compatible. Youll find that the 2008 caliper is too small to fit the 15" rotor. Also, the 2008 pad is only going to fit the 4 piston caliper; its about 2 inches shorter than the 6 piston pad.
You will want to have the rotors machined as well before installing the 6 pot calipers and pads.
You will want to have the rotors machined as well before installing the 6 pot calipers and pads.