Engine Crankshaft Main Bearing Set Engine Part Number MB5659XP King XP. High performance. Tri-Metal. STDX size is .001 extra clearance. Thrust washers not included use TW611. High performance. King XP. Tri-Metal. STDX size is .001 extra clearance. Thrust washers not included use TW611. When depleted use MB5840XP; Sizes : STDX