Serial 2B189303.
2015 Mercury 115 4S CT
Time for my second lower unit gear lube change. Since I was working at a marina on friday I wanted to buy gear lube and 2 screw seals. From previous experience I know my lower calls for yellow seals part number 830749.

They tried to sell me blue ones and told me that is all they use. Since I have have to work there for the next week I did not want to raise a stink so I got the lube and 2 blue seals.
On the way home I stopped at the marina where I usually buy my stuff and got the right seals.

Now for my question, anyone know what the difference is between the 2 besides a 3 dollar a piece price difference?