Seals to the change shaft are often integrated with Mercury gear housing kits much like the a single we used in the video down below, which also arrived with input and output seals for that lower unit, along with a new gasket for the shift shaft housing. MARINE ELECTRONICS or https://stephentydhk.bloggerswise.com/38710034/how-to-repair-lower-unit-skeg-no-further-a-mystery