Gearbox Sprocket Nut, for use on BSA models: Bantam D1, D3, D5, D7, D10, D14 & B175.O.E.M: 90-0172 / 90-172Thread: Left Hand Thread. Gearbox Sprocket Nut, 90-0172 / 90-172, G20GSKU: 90-0172 / 90-172£5.19PriceQuantity*Add to Cart