Have you taken your sample stud to a truck suspension and brake shop? Not a dealer but an independant specialist in these areas with a parts department run by an older guy who can work a catalog as well as a computer and likes a challenge to help a guy. In Ottawa I try Malmberg equipment for this but they are only in this area. When I was looking for dowel washers (cone shaped, used to locate axle shaft to hub studs) they pulled out the Euclid (part of ArvinMeritor) catalog and that catalog had over 20 pages of wheel studs.
Have a look at http://xpresswaypluscatalog.arvinmeritor.com/
Good luck.