The lower mounting point on the factory front fender brace/stiffback, as well as, the reprodution fender braces, have a weld nut installed in them. The factory shoulder bolt has an oversized washer on it, that can not be removed, that keeps the head from pulling through the lower fender brace bracket that is mounted to the firewall flange of the cab. There is no need for jack nuts in any holes, if the weld nuts are in place, as they should be on reproduction or OEM, used fenders.