Re: Girling 10" Brake Backplate TR3A?
Initial change to Girling brakes was TS13046 (circa 1956), and the change from 10" to 9" rear (still Girling) brakes was around TS56377 (circa 1959). I'm relatively sure that the 10" Girling backing plates would not have been the same as those for Lockheed brakes.