The oil seals coming with the Athena set have a poor quality. I don´t use them anymore, some are OK and it works fine for a while, some are cracked in the moment you install them. Origins from Yamaha are not too expensive.

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I do not know if this is the only solution, but the gaskets from Sepp are easy to install (not too much torque needed)  , they are tight  and also not expensive,
Regards Ali

Best way is to take the original. They are not expensive, and you ned only 4.
S.

I had the same problem with the head gaskets had no luck trying to source Yamaha one's tryed seppl but no luck there either so made my own out of copper seems OK so far  

I glab er hods ned dawardn keena.............Translation: i believe, he cannot wait about them. But we stay in holiday for 10 days.
the gaskets lie in the package for two weeks, now they are back in the box, means, we have about twenty pieces in stock.
In copper you get many different problems! the copper ring works into the aloy from the head, the heat between the cylinder and
the head is interruppted, if you have a distance between head and cylinder and so on.
S.

I just found out that the shop where I bought the athena gaskets also sells oils seals (same component number) for 4.40Euro/ a piece.