Is it possible (and not too difficult) to alter the headlights on Freelander 2 (58) so they can be used in Europe?

It crossed my mind that it could be wheel bearings. How can I test?

The rear diff was replaced 1500 miles ago!

I seem have developed a low rumbling sort of noise detectable at quite low speeds <40 mph. Don't think it's tyre noise. Seems to be more from front than back. Otherwise car running well. Any thoughts?