very different process to mount a gt750 hub in to Norton forks compared to how much I had to modify the Norton brakes, narrower shoes, convert RH to LH operation , new brake shoe pivot pins, modify brake camshafts, new brake torque arm fixing for both sides, cable holder left side, fit steel inserts to brake plate axle holes, LOTS of machining of brake plates and hub etc etc. Yes many have fitted the GT750 brake to Norton forks its not uncommon. I sell a modified TZ 260mm Yamaha 4LS brake for Norton forks, its very popular.