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Go to the dealership - i lost one myself awhile ago if i can recall its the plug for the "adjustment port" or something silly, costs about $1 use some locktite on it.
Depending on what year you have, you may have to replace the bezel too. They changed the assembly at some point because these plugs kept falling out....so the new plugs are too small for the old bezels. You could use some loctite or glue, but it's better to just get the new bezels.
Bezels..is that the correct term for the plastic shroud around the headlights?
Where can I get the headlight plug for the passenger side? It's the round plug that is on the in-board side of the headlight assembly.
It looks like you have an '02 from your profile so you can simply pick up a replacement from the dealer. The design changed in late '97/early '98 and the two parts are not interchangable.
The second design is a black plug with a "coin slot" on it. P/N 10435410
It is made to mate up with headlight surround (bezel) LH P/N 10436411, RH P/N 10436412.