Because the lenses are not on the front 'glass' of the headlamp, (because the beam is controlled by the relector) fitting beam delectors is really a rather hit and miss affair with these kind of lamps. As far as I see it, you have two choices. 1) at night, switch the lamps on and, with the lamps shining on a wall, experiment with the beam deflector so as to eliminate the left hand assymetrical 'flip', which is what will cause upset to the little French people. 2) Don't bother, (after all, they couldn't give a tuppeny ***oops*** when they bring their cars over here (for the most part)) but merely lower the lights with the headlamp level control sufficiently so as to not cause dazzle to oncoming cars. After all, you only need the lights to BE seen most of the time, not necessarily to SEE. However, You have the added advantage of being able to raise the lights when on an unlit country road. This is what I do!