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I thought you could be lucky - my 2014 XK headlamp beam pattern is suitable for driving on either side of the road and there is no need for adjustment for driving abroad. My earlier 2007 XK had a lever in the headlamp unit for switching the beam dip direction.
Unfortunately the X351 is NOT like this and the LHD and RHD headlamps have different beam patterns.
According to the Parts Catalogue, there is also the consideration of LED, Adaptive LED and Bi-Xenon headlamp options on the X351 to further complicate parts sourcing.