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Ybz-58-15 Power Steering Pump Pulley 126mm Outer Diameter 16.95mm Bore Pk4 V-Belt for Automotive Steering Systems. High quality 126mm PK4 power steering pump pulley produced with precision machining for reliable fitment and stable performance in automotive steering systems. Well-designed PK4 groove ensures strong belt grip, reduced slippage, and efficient power transmission to the steering pump. Dynamically balanced structure provides low vibration, quiet operation, and consistent performance with 16.95mm bore.