Ok I finally have some answers. If you have the old version compensator with rotor 30041-08 and want to upgrade to the latest and greatest compensator, you can just purchase compensator 42200064 which does not come with the rotor but says you need 30041-08A. Harley told me that the specs on these rotors are identical and the "A" was probably a supplier change. I also went to the dealer and they have in stock compensator 40100061 which is the one that comes with rotor 30041-08A. I brought my rotor 30041-08 there and compared the two and the measurements are the same...mine actually looked nicer. Hope that all makes sense.