For high performance engines (especially in a Mini) an efficient crank damper is a necessity to reduce failure. The standard damper commonly used is barely adequate for the standard engine. This rebuilt original "S" damper is superior to the standard item. The damper ring 12A367 can be bolted directly to the toothed belt crank pulley, or used with the original V-belt crank pulley AEG454. These are in VERY limited supply, please call to verify stock before placing your order.