This genuine fan assembly is designed for reliable performance in select 6BT, ISB, and QSB engine platforms. The part numbers 3913433 and 5260996 ensure you receive an original equipment component, manufactured to exact specifications for a proper fit and optimal cooling. It is a direct replacement for maintaining the correct operating temperature and protecting your engine. Crafted from durable materials, this fan is built to withstand demanding conditions, offering long-lasting service. Sourcing this authentic part helps preserve the integrity and efficiency of your engine's cooling system. It is suitable for repair shops, fleet maintenance, or owner-operators seeking OEM-quality replacements. Ensure your engine runs cool and efficient with this original fan accessory. Please verify your specific engine model and existing part numbers for compatibility before purchase to confirm this is the correct component for your application.