Longer wheel studs?
I have heard that they reuse the centers to make custom steel wheels and this show that. If this happens to be the company or the same type of company that made the wheels and they used a 13" original center that was never made for 10" brakes or disc brakes it is where the problem comes from. All 10" drums and disc brakes had to have 14" wheels.
We now offer a wide variety of newly manufactured Mopar/GM/Ford, factory steel wheels. Mopar Magnum 500's, small or big bolt pattern rallye wheels in argent paint or chrome and a variety of sizes and offsets. We can make cop car, standard steel and stock small bolt pattern wheels to just about any width and offset.
Chevrolet SS and rallyes, Pontiac rallye II, Olds rallye (442 style), and Buick rallyes are also available in a multitude of configurations and finishes.
We start with an original steel wheel, inspect the stud holes and face finish of the center for damage or wear, and remove the center from the old wheel. We re-use the original centers because they are made with a better, stronger alloy than most current stampings. This helps keep the assembled tollerances much lower than most new wheels. The centers are then re-conditioned to the customers needs, and fitted into a new rim shell. Wheels are then set to the desired backspacing and MIG welded into place, using state-of-the-art equipment and operators. Our welds are full-circle as opposed to the factorys original partial welds. What it boils down to is this: we have the time to spend building your wheels to closer tolerances than most mass manufacturing plants do. Most wheels made now days have +/- .020 variance, or 'wobble' that is considered acceptable. We get ours as close to zero as possible, but due to manufacturing variances in the new rims, it just cant happen. We can generally get it down to +/- .005.
We can also use your wheels as cores to build you a new set. Save $20 a wheel by turning in your old ones.
http://www.themopardude.com/New_Custom_2.html