Probably Old News... but...
Just the molding used and the rotor is an all-in-one peice design (the part that broke on mine and many other Optis).
Just looks to be a cap and rotor replacement.
Obviously for those who are anti opti this wont change anything..but when the GFs Opti need its 100,000 mile rebuild I will be getting one of these kits for it.
Might as well get it done early. 

