Reply To: stud bolt size/lug nuts Home › Forums › Discussion Forum › stud bolt size/lug nuts › Reply To: stud bolt size/lug nuts May 24, 2017 at 2:10 pm #756 MooseKeymaster The original studs on a ’67 coach would have been 1/2″, but it’s very possible that someone may have upgraded them to a larger size. It would be best to press one out and take it to a parts house to compare. Moose