Just remembered something else, ED Mcyl ports are different config to AU. If I remember properly then ED had a tin booster? with the rear lines coming from the Mcyl at the booster end (back of the Mcyl. AU had a plastic booster with the rear lines coming out of the front end of the Mcyl, the fitting to the rear port also went from 10*1 thread to 12*1 thread. It is very important to use the correct port otherwise you will end up with proportioning to the front brakes instead of the rears, if that happens then you WILL be performing ground loops down the road when trying to brake. One more thing the Booster output rod to Mcyl clearance will need to be checked (set) if you fit an AU booster to an ED booster. One more one more thing, check the proportioning number on the front of the Mcyl, it should read something like
""" C2.4 or C3.1 or whatever. """"" if you go bigger on that number then again you may see ground loops while trying to brake.