Timing Gasket, for use on BSA models: B31, B32, B33, B34, M20, M21 & M33.O.E.M: 66-1920BSA B31-B34, M20, M21 & M33 Timing Cover Gasket, 66-1920. GAS 67.SKU: 66-1920£3.69PriceQuantity*Add to Cart