The bottom set are the standard Thunderbird non-vented wheels. The top set are vented wheels which were used on a number of different Ford products. I believe they are slightly thinner. At least the vented ones that I have are. Both will work on drum brakes. Neither will work on disc brakes. They will work fine with dog dish caps but the vented and non-vented difference will be noticable.
Last edited by jopizz : 03-05-2012 at 10:03 PM.