I think this link should be helpful: DIY : Replace headlight vertical aim adjuster motor (xenon headlight) - Bimmerfest - BMW Forums

Another link on the same topic is here (it also references the link noted above: Headlight Height - Bimmerfest - BMW Forums

Hope that helps.

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Stephen
2010 e70 35d- now driven by son #2
2005 e53 3.0 - now driven by son #1
2021 G05 45e PHEV - now driven by me
2008 ML320 CDI - driven by wife