You can retro fit oem xenons with no issue. People say you need auto levelers and washers,
But you dont in order to pass a UK MOT.People will also say that the police will pull you up on it, but find a sharp eyed copper that could point this out on the roadside

You can fit washers and levelers but you will end up spending another £350 appox to do so.
I have done the same, no levelers nor washers, and have had them set up at an MOT centre on the lower setting incase i ever carry 3 fat blokes in the car so that i dont end up blinding anyone.
Been on the car for 6 weeks or so, with no issues whatsoever.
