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On mine its the silver one that adjusted the hight the black one adjusts the left or right. Here's pic of the adjuster for the left/right for the low beam.
Oops, sorry wrong pic. Thats the high beam one left/right adjustor. This is the low beam left/right adjustor and this silver adjustor is the one that did the hight on mine. Had to remove the battery to get to it. Not the most spacious engine bay.