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 807639A3 Fits 1996-2001 MerCruiser Marine & MerCruiser Inboard V-8 (454 & 502 cubic inch displacement) engines.