Maybe one of these similar products would be of interest:-

NORTON AMC GEARBOX GASKET SET 1957 > 67

NORTON AMC CLUTCH SPRING ADJUSTER NUT X 3 PRE COMMANDO AMC CLUTCHES 04-0389

AMC norton 040119 gearbox selector fork

04-0038 NORTON AMC '57on GEARBOX GEAR LEVER RATCHET SPRINGS X 2

Norton AMC Gearbox Mainshaft First 1st 14T Gear