FYI, I also have Z1 2 piece rotors. It appears the front steels will need to be replaced. I do have over 70k on the brakes and rotors. I need to take some measurements but it looks like replacements will be needed. So, that being said. Make sure you can get the replacement steels in the future. I am very happy with the Z1's 2-piece rotors front and rear.
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