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What exactly is RHD and does that mean it can't be used in US versions?
In the US the right (passenger side) headlight and lens are aimed and point higher so as to illuminate the right road shoulder and signs better. The lens also projects light further on this side. The left (driver) headlight and lens do not project light as long as the other and are aimed futher down so as not to blind on-comming traffic.
The advice give to you by Amdeutsch basically warns you that the light projections and patterns might the reverse of the US spec I explained.
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Slideshow: A one-of-one U.S.-spec Mercedes-Benz SLR McLaren Roadster became even rarer after a factory-backed transformation at McLaren's headquarters.