Gearbox sprocket 18 Tooth, Norton AMC and laydown gearbox, 5/8" x 1/4". Suits Norton singles and twins, AMC gearbox from 1957. Can be used for Norton laydown gearbox with addition of the same spacer used on the AMC gearbox part 040131.
Original part number:
040010; 040454 - axle sprocket (should fit E12/368 Norton laydown gearbox with use of spacer)