That's going to be tough, since they're built into the wing. I suppose you can cut a hole and epoxy one in there. Why don't you take off one of the nuts and match it? That will definately get the right size.
Please clarify your question. As rbirling notes, the bolt is secured into the wing. Nuts are screwed onto the threaded stud. Are you simply missing a capped nut? Or did one of the studs get damaged?
If you're just missing a nut, take one of the other ones to a car parts store. Most have a display for car nuts and bolts with a sizing gadget. Don't bother with a hardware store. Most of them don't stock metric sizes.
If you want to get the piece from Acura, it is a "Nut, Cap, 6MM", part number 90303-SB0-000. (Note, that might also be 90303-S80-000.)
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