When SPMotorsports had the coil listed, they stated that. I'm really not sure about the cable end differences and how the clipless cables stay attached. It's possible that the Accel coils just don't have the ridge for the clips to clip to. Or maybe on the new ones the wire snaps to the coil similar to how it snaps to the spark plugs. Since it seems no one has gotten one of these coils yet, I really can't be positive. I'll ask some of my Cougar friends if they happen to know the coil/wire differences.