The part # for the O-ring is 302540, and the part # for the carbon seal is 302538. The Quad-rings are available from many industrial suppliers based on size(McMaster-Carr) but offhand I don’t have the size.
I believe it is this one, but do your own research.
https://www.mcmaster.com/90025k364
David Bartlett
Pine Tree Boating Club Chapter
"I don't fully understand everything I know!"