25-20633 o ring, water tube Mark 20

10-20261 - Vent screw new # 10-28653 stainless steel with gasket

$ 2.95

18-2624 - Lower unit seal kit 9.9 & 15hp 4 stroke (Big Foot) G760300 & up, Magnum/Marathon 15XD/Super 15 all, 18 & 20 hp, 25hp, 25hp 3 cyl. Lightning

$ 58.65

Mercury lower unit seal kit KF5, Mark 5, Mark 6

$ 49.10

V046022 Lower unit seal kit Mercury 4 cylinder (1961 and prior 4 cylinder gear shift motors, except Mark 30)

$ 63.95