Topic: o-ring size for oil orifice? ('78 CB750K)

[denward17]

I'm looking for parts when I take off the valve cover, cam towers to replace leaky pucks.

I see listed o-rings for the oil orifice (4 I think) have 2 different sizes.

Which size do I get?

O-RING (5.8X1.9)
91305-323-000

or

O-RING (5.6X1.9) (ARAI)
91318-ME5-003

[PeWe]

5.8 x 1.9 mm is what I have seen to later heads.
Used that on K6 and 392 head.