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 860427A5 Fits the following models: 1997-1999 MerCruiser Marine V-8 (305 & 377 cubic inch displacement) engines (serial number 0K001501-0L618999) 1997-2001 MerCruiser inboard & Tow Sports V-8 (305 & 377 cubic inch displacement) Gen+ engines (serial number 0K040006-0M299999) 2001-2002 MerCruiser inboard & Tow Sports V-8 (305 cubic inch displacement) Carbureted engines (serial number 0M300000-0M316999)