Jeff, I believe the bracket is riveted to the stake pocket-but Lawson would know for certain. I think there are some photos in the Mack Hils book on early pickups. I bolted mine using carriage bolts to the stake pocket but I think rivets are correct. If you have a rear bumper, it obscures the license plate-I moved the plate '36 California plate to a bracket/frame I welded up and attached to one of the bumper bolts, and just kept the month/year tags under the taillight
Adam