Fitted the front of the crankshaft, the vibration damper/harmonic balancer is designed to counteract the natural imbalance of your BMW's diesel engine. Over time, these will simply wear out or can fail suddenly. Excessive vibration and potential damage to your engine can result, which is why a quality replacement is a must. With the longevity of your engine in mind, we offer this quality replacement from INA. Bolts included.