Offset wheels

Ive got standard disco alloys on my truck and would like to achiveve a wider wheel track mainly cos i think it looks the bollocks. Does anyone know what the maximum offset you can get is? 50mm would be plenty i think if possible which then leads to next question where can i get them from???

30mm or 60mm i've seen any more and you will eat wheel bearing like a whore wears out knicker elastic

nice! lol. was just looking at the 60mm spacers i found on simmonites, do you know if you can fit alloys to those spacers or does it have to be steels? i was wondering after seeing the wheel nuts supplied with the spacers
http://simmonites.com/wheeladapters.html