This is too late to help the OP, I know, but here are the parts I replace whenever I'm taking the head cover off:
Oblong o-ring: 11178-24B00
2 X valve cover cap o-rings: 09280-60004
Camshaft end cap: 09241-30008
5 X washer gaskets: 09168-06023
The washer gaskets go under bolts 1, 2, 3, 4, and 13 in the pic below:
Incidentally, the above pic shows the torque order I used on the 14 head cover bolts.
All of the parts I listed above should be pretty cheap (nothing over $3.00, except for the camshaft end cap - which can
probably be reused in most cases).
IHTH someone!