I have actually had trouble with this one in the past, the diagrams aren't entirely clear which of the three candidates is the fill port.
I do know the drain gasket is 35178-60010
The fill o-ring is either 90301-15004 or 90301-11030
There is info buried in the big fluid exchange thread on the 8-spd.. maybe a little more specificity there?
I finally pulled together the video I took while completing a complete transmission fluid flush. Most of you know the dealer's service typically consists of draining and refilling the pan only. This only introduces 3-4 clean quarts of fluid in the system. I went through 14 quarts of fluid...
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