Gearbox mainshaft bearing packing/ oil retaining washer (shim) for Norton gearboxes, fitted between end shell and main bearing. Norton doll head and upright boxes 1934 to 1948. laydown boxes 1949 to 1956. OD: 1-7/16inch (36.3MM); ID: 5/8inch (16MM); TH: .020inch (.5MM)Original Part Number:9666; A2/323 - Mainshaft bearing packing washer