I've noticed on several of these BB wheel posts there's 9/16 and 5/8 stud sizes. I figured the 9/16 were for 1.5 Ton and the 5/8 were for 2 tons. I got all new 5/8 lug nuts from the truck shop that made my new U bolts for the springs. I've never had to replace any lug bolts. Amazing for almost 70 years old!