Feature●This gearcase seal kit replaces OE#: 26-77066A1 and fits 3.9-9.8 HP Mercury, Mariner, and Force outboard lower units from 1975-1986.Description This gearcase seal kit replaces OE#: 26-77066A1 and fits 3.9-9.8 HP Mercury, Mariner, and Force outboard lower units from 1975-1986.