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Diesel Power Engine 4b3.9 6b5.9 Qsb3.9 Qsb5.9 Fuel Injector 5367913. Direct Replacement & Perfect Fit. This product is designed to match the exact specifications of your vehicle's original part. No modifications required. For protecting the core components from damage and ensuring overall system reliability. Ensures Optimal Engine Operation. Durable Construction for Longevity, Manufactured by high-quality materials.