Mercury o-ring. 35 HP (350), 65 (650) 63-69 HP 4 cyl. 63-69 70-71, 90 (900) HP 6 cyl. 65, 95 (950) HP 6 cyl. 66-67, 100 (1000) HP 6 cyl. 64-65 68-69 66-67 (1100), 110 HP
Mercury o-ring. 35 HP 2 cyl. 70-71 72-74 75-77 73-76 73-75 84-86, 40 HP, 65 HP, 75 HP, 80 HP, 85 HP 73-77 69-72 78-79 84-88, 70-72 73-79 78-79, 115 HP 90 HP, 140 HP, 150, 125 HP 68-69 HP 78-79 73-77 78
Mercury o-ring. 88-89 70 HP, 80 HP 87, V-105 96 135 HP 86-88 89-90 91 98 & up, V-, V-94-95, V-150 86-88 89-90 88 91 93-95, 140 Jet V-175 91, V-200 82-90 91 89-90 87-88