Hy jaycoop, have you read " Wheels and Tires, what to do" at the top of the "Big Bolts" forum? We have basically two types of wheels on our "Big Bolts", stud piloted and hub piloted, then there are all the different bolt circles, stud counts, stud sizes and center hole dimensions. There are three major wheel manufacturing companies, Motor Wheel, Kelsey, and Budd and of course Firestone manufacturer of the "Widow Maker" RH5. Different truck manufacturers seemed to prefer one type of wheel over the others. In order to try to help you identify what you have, we would need more information, stud diameter, center hole diameter and wheel type, stud piloted or hub piloted? Wheels on "Big Bolts" is actually a large subject and will take a while to absorb it all, good luck.