Machine washer 9/16 inch, stainless steel, each, Rear axle spindle all Norton models up to 1975, Not for MK3 disk brake; also gearbox top mount washer. Accurately machined and perfectly flat, ss, 9/16in X 1-1/8in X 3.25MM (14.4MM X 28.5MM)Original part number:B2/659; 19266; 067738 - rear hub spindle washerE5454 - washer (gearbox top mount)