Some engine models will require a closed cooling kit, a belt kit, and a seawater pump kit. Other models will not require all these kits. A note indicates that there might be a different kit that is required to make the kits fit the engine on which the closed colling is being installed. Front mounted kit. Full closed system which also protects the dry joint exhaust manifolds from corrosion. 2014 & newer MerCruiser Marine 4.5L Multi-Port Fuel Injection engines (serial number 2A441953 & up).