Norton gearbox bottom mounting bolt nut, shaped+ washer. A new Norton upright & laydown gearbox mounting bolt nut. Suit Nortons with centre stand with side mounted spring from 1936 to approx 1953 (not swingarm or featherbed models). Covers all models ES2, 18, 19, 50, 500T, 7, 77. Fits to 3620; A2/313; E4533 3619; A2/312; 18495 Original Part Numbers: 3920; A2/313; E4533 - Gearbox bottom bolt nut
