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. Side mounted kit 61086A11. Fits the following FRONT MOUNT engines: 1983-2016 MerCruiser Marine 120, 140, 2.5L & 3.0L/LX