Mercury - Bell Housing Gasket Kit Marine Seal Set MerCruiser MC-I Drives 64818T4. Overview. A tight seal means fewer problems on the water. The Mercury Marine 64818T4 Bell Housing Gasket Kit gives you all the right pieces to reseal and protect your MerCruiser MC-I drive. Designed for drives with serial numbers 6225576 and below (1967-1982), this kit includes five factory-spec gaskets made from durable, marine-grade material that won't dry out or shrink. Replacing these gaskets during service pre