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. Bantam Gearbox Sprocket Nut: 90-0172 / 90-172. G20G / 28953SKU: 90-0172 / 90-172£7.99PriceQuantity*Add to Cart