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Zyb08048r-569-320 Power Steering Pump Pulley 90mm Outer Diameter 15X18 Spline Bore Pk4 V-Belt for Automotive Steering Systems. High quality 90mm 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 15x18 spline bore.