You can use a stud with a larger dia knurl. Just drill out the hole in the hub to the proper size for the knurl you use. You most drill the hub in a drill press. It is important to get the hole square to the drum mounting surface. You will have to search for the correct stud. You will want to keep the 7/16 thread size (unless you want to drill the holes in the drum larger and use different wheels), and have the required knurl size. I have done this and also redrilled for the 4 1/2 inch bolt pattern, on the front and rear. I need the longer studs for Drag racing, and "Mag" wheels. It takes some searching to find the correct stud.
