I have a 98 accord 3.0. auto parts store shows a low beam bulb in 9006 high beam 9005. On my harness the high beam is 9006 and low beam is 9005. Theres also an unused plug ziptied off by the transmission
could this be a wiring harness from a different vehicle?

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The low beam bulb will be dual filament and goes behind a reflector in the housing. High beam is single filament and shines straight through the housing cover.