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.
SOURCE: Headlight adjustment instructions
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: Aim the headlight directly at the line you marked on the wall.
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