I have installed a Scarebird disc brake kit for my 53 1300 with 16" and six boltX5.5 wheels. All parts fit well and includes brackets spacers and bolts etc. Scarebird tells you what to buy in your parts store. The rotors include an integral hub set up for tapered roller bearings. I did install a 1/4" spacer on the hub and had to grind off about 1/16" off of the calliper where there is a sharp corner. I chose not to change the hub studs as suggested so bought 14 X 1.5 lug nuts instead. There is not a lot of clearance at the moment between the wheel and the calliper and I'm concerned about heat build up and expansion of the calliper. Wondering what would be appropriate clearance. Ill be installing a dual master cylinder with vac. booster which
of course is on back order