I have a Tohatsu 4 stroke (2019 MFS 30C). It's time for the 20 hour service. I have the seals for the lower unit oil drain screws, but I'm having a hard time finding a part number for the engine oil drain screw washer. I believe it's made of soft aluminum (crush washer, not to be reused). Any help will be appreciated. Hope all are healthy out there during these crazy times.