Anyone running billet specialties street lites?...question.

Lug Nut Shank Diameter (in):0.679-0.687 in.

Nice wheels, I don't think 1/2" studs would be a problem that is a pretty standard size. Let look up lug nuts.

Yep these lug nuts will work with those wheels and 1/2 studs except you would want standard style washers.
http://www.summitracing.com/parts/crr-27723-4/overview/