All light are ok, modification no needed at all, if car is from EU, USA or Japan, maybe some other countries also, but not remember all.
Only modification what is needed, is RHD to LHD. No E approved lights needed. So if you modify stock headlights they are ok, but if change them to LHD, they are needed to be E approved, but who knows that bcz LHD/RHD compatible headlights available. Like my mustang headlights can use in LHD or RHD countries.
Usually the modification of stock headlight is easyest and cheapest way. Offcourse depends on car.
In a spring i import car from USA and only dot lights, no any modifications, no height adjustments etc.