Sorry for the confusion. Here in the UK we refer to bolt sizes as UNF or UNC whereas you Americans tend to use the thread pitch. We say 1/2" UNF and you say 1/2" 20.
Also you never hear the term lug nuts in the UK, we call them wheel nuts.
So what I meant to say was, if you are looking for a nut for the steering wheel you can use a lug nut, just cut or turn the tapered part off.