Grant .......... we never had rear discs...... were not allowed to run 4 wheel discs in pre 65... I feel you dont need them either as we got these cars very light & had good front brake package , remember 70 to 80% is front brakes to stop of slow down the car , never had a brake issue even the breed van anglia Gary raced I dont remember a brake problem & these were solid front discs normally in those days DS11 pads were the go , so if you want to stop better you now have different calipers , bigger , lighter, more piston area, vented discs, better pad material etc etc , better weight transfer on to front wheels , better tyre grip the list goes on , you shuld be able to stop on a 6 pence ??? with just that combo..........I am not saying that yr idea wont work either but you might not need to go down that track........... Hope you all good up there Grant E ............. Grant S