Feature●This shift slide replaces OE#: 20843 and fits 40-70 HP 2 stroke (1977-1997) and 40-75 HP 2 stroke/ 4 stroke Mercury lower units from 1991-current.Description This shift slide replaces OE#: 20843 and fits 40-70 HP 2 stroke (1977-1997) and 40-75 HP 2 stroke/ 4 stroke Mercury lower units from 1991-current.