There is a video on YouTube somewhere of someone with an E85 that shows that there is a lever to switch the lights over for Europe. It was that video that led me to take a look at mine and once I accessed the lights and took out the bulb the lever is there and you push it up or down to switch the lights for RHD or LHD.
I have done this twice once to switch it to LHD to pass the ITV and then switched it back again to RHD. Another forum member also did the same based on what I put in my thread.
Could it be that BMW fitted different versions of headlights during the years?