1968 C-10 1/2 ton Chevy pick up truck. 6 lugs. 7/16". This truck has big wide Rally wheels on it. Had the tuck about 3 years. It,s always brakeing the front lug nuts. All on them. I guess the big wide wheels and tires just put to much pressure on them. Not the stock wheels ofcourse. What I,m going to do. Is put some 1/2" lugs on the Wheel thing.( don,t know what it,s called.) What I would like to know is. What size should drilled the holes out to put the 1/2" Lugs in?