We have seals and anodes for your upper and lower unit alpha one generation 1. It is a prerequisite to change these products at the beginning of the season, because corrosion could be formed.
It is therefore important to check your cylinder head anode seal frequently. It is important to have a marine grade anode for protection of your alpha one generation 1 lower unit so that corrosion does not destroy it.
A marine grade will protect your propeller, keep in mind that more than you are in salt water and cold water there is a greater danger to corrosion. Corrosion can make short circuits and bad connections and even destroy parts of your boat.
Replacing an anode is an inexpensive project to do by yourself.