Norton gearbox bottom mounting bolt set (shaped). A new Norton gearbox mounting bolt + nuts & washers for laydown and upright boxes, with centre stand, ZP. Suit brazed frame Nortons from 1936 to approx 1959 with centre stand with side mount spring. Later swingarm and featherbed models used the plain nut with the same bolt but had a different spring fixing. Covers all models ES2, 18, 19, 50, 500T, 7, 77 Original Part Numbers: 3619; 9461; A2/312; 18495 - gearbox bottom bolt and nut x1 A2/313; E4533 - Gearbox bottom bolt nut x1 (shaped to hold centre stand spring) no part number - washer (correct size) x 1 AKA 9461 gearbox bottom mounting bolt and nut