I am changing the VTC sprockets on my mom's Z ("mom's Z" to AZHeat and LJ) to the BDE ones. It has bigger cams (newer style, but I am not positive which cam it is) and it had the new style VTC sprockets. I bought a set of the JWT adapters so I could use the old style sprockets, but to my amazement there were already some in the car! The sprockets all looked lined up, so I am wondering how that is possible. New style cam, new style sprockets, and the adapters to use the old style.