Headlight adjustment left and right hand drive

Most headlights are built as a fixed Left or Right and most can't be converted as it is the reflectors inside the headlight that controls the direction of aim. To do it correctly you will need to replace both headlights with the correct aim units.

Yes they should be adjustable because people change tyre profiles front to rear and this alters the drive angle.The adjustment screws are in the headlamp housing behind lamps accessed from the hood/ bonnet side.you do need to do this properly so they align together at the legal height for full beam.there is plenty of online information on the correct height for full beam...once you have made sure all Your tyres are at the right pressure....park on level ground ...at least 3 meters from front of a wall ....and at right angles to the wall....measure the height to the centre of headlight to ground .......mark the right light horizontal line for correct height on the wall and make sure you put lights on full beam....they should shine slightly below (say an inch )to the marked the measurement of height of lamp on the vehicle....adjust until the right hand light horizon is an inch below...now mark vertical line to cross centre of reflected light....this will give you a register point to mark where the left light should fall ...this will be exact distance apart as on vehicle and again adjust left until it falls below 1inch of the measured height line of lamp on car......mark distance from right to left light and mark the same height in chalk....then adjust left light to pinpoint marked chalk cross.adjust the beams by turning the spring loaded screws behind the lights.once you are happy check dipped positions....on right hand drive the lights should dip below and left.left hand drive dip below and right.you probably didn't need so much info but ...hey it's free and it saves any misunderstanding.hope this is of help...please vote.thankyou.

adjustment is on the top of the light and the side.

There are two adjusting screws on the back of each headlight, as a rough check for the alignment, on flat ground, drive the vehicle right up to a wall, mark the centre of the light on the wall, reverse the car straight back about ten feet. Switch on main beam and the beam should shine straight at the mark you made on the wall. Dip the lights the beam should drop and go left by about two inches (UK). Left hand drive the beam should go to the right and down (US).

Unfortunately you cannot. The beam pattern itself is different. On left hand drive cars, the actual beam is designed to throw the least amount of light into oncoming cars and will look something like this.
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you can't change the pattern as the housing unit itself is what depicts the pattern projected.

The adjustment screws/nuts should be located either on the top of the headlamp assembly, behind the headlamp assembly, or near the frame rail by the radiator support.

You will have vertical adjustment screws for each independent beam (separate highs and separate lows, but will be same screw if highs and lows are the same bulb). You may also have additional horizontal adjustment screws as well

Park your car on a level ground 30 feet from a wall and measure the height from the ground to the bulb and mark on a wall (do this for highs beams and low beams if the bulbs are separate, if highs and lows are the same bulb, only do it for the lows)

For Low Beams: If the headlights read VOR, then aim the brightest part or cutoff part just below the mark on the wall. If it says VOL or nothing, aim them 2 inches below the mark on the wall.

For High Beams (if separate from low beams): Aim the headlight directly at the line you marked on the wall.

The lenses themselves cannot be adjusted to conform between left hand and right hand drive. The reflector or projector of a left hand drive vehicle is designed to throw more light towards the right side of the vehicle and vice versa for right hand drive vehicles.

can i just alter my headlight on my z3, by the adjusters on the back of the headlights. i want to switch from right hand beam to left in france,

There are two adjustment points (screws). For example left headlight: you will see one point near the end of left wing, at bottom side through a wing hole. This is for vertical plane headlight beam adjustment (up-down). Another one point is against water radiator side. This is for horizontal plane headlight beam adjustment (left-right).
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you can just change the headlight lens if available

No need to replace the bulbs. They can be adjusted by most inspection stations.