Have a pic or p/n? My pistons contact the pad directly.. I know atc rear calipers have another part though.
Its a good thing you dont race TT & got to run with a bunch of them obnoxious 4 pokers, cause you would end up boiling the rear brake fluid real quick from transfering heat if you didnt get the hole shot, from riding the rear brakes trying to keep from running over them fools going into the corners.
I've tried everything I can think of, even got them little fibers in place on the pistons, added exhaust wrap behind the pads & every time I turn around she aint got no rear brakes.
I did find one time, the piston in the master cylinder wasnt moving freely & holding the brakes on some, but fixed that & still got a brake problem.
Dang rolling into the corner 4 pokers.
Neil