Hiya!
Fitting is easy peasy..
By law though you need auto levelling and also light washers...
However mot testers do not check if you have auto leveling!!!
So its just the washers you need to sort out...
To retro fit auto leveling will cost you an absolute mint!!! As you need to fit sensors on the front and rear axels then actuators for both of them and the list goes on.
Here is a pic of how auto leveling works:
I'm going to do my conversion if i don't get xenons with my 225, and i will deffinately be changing my fogs over to xenons!