You could use a hanger off a 'Performance edition Z1000R'. It has another bracket to hold the preload adjuster,while the rear brake reservoir is moved lower on the rear hanger.So Maxton emailed me back and said that they do not sell in the USA.
So I’m looking at the R2 Nitron rear shock as an alternative along with a few other manufacturers. I’m waiting for them to confirm installation pics so i can review. i'm told that their R3 rear shock requires you to remove and discard the rear passenger foot support bracket to make room for the pre-load adjuster. i’m not excited about doing that and probably wouldn’t.