I had plenty of clearence w. the hybrid kit, and considered changing my brackets to the C5 rotor because of it (before I went c6 z06). I can post pictures if you'd like to get and idea. If I can find some?
Not the best picture sorry. If they were still on i would go take a picture for you. The spokes have enough curve to them that they offer plenty of clearance for the c5 rotor which has less offset then the c4's in the picture.