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 860427A7 Fits the following models: 1999-2001 MerCruiser Marine V-8 (305 & 377 cubic inch displacement) engines (serial number 0L619000-0M299999) 2001-2002 MerCruiser Marine V-8 (305 & 377 cubic inch displacement) Carbureted engines (serial number 0M300000-0M590000)