Join Date: Nov 2012
Location: Bay Area, CA, USA
What I learned the hard way in my link in post #8 is that unless the aftermarket rear rotor comes pre-tapped to accept the screws that attach the ABS sensor ring, you're out of luck. Like the OP, I searched high and low with no luck and had to go back to stock.
As that was a few years ago, maybe there is an option out there now, but like the OP is finding out, it's a fairly rare bird if it does exist.
2012 Arctic White 1200S Touring Model