[Rory McNeil]

Not really sure what the "Derby cap" that you are refering to, but I have Wheel Vintique Series 61 steel wheels on my 59 Ford (15x6 front, 15x8 rear). These wheels look like a factory steel wheel, and they fit the factory Ford 10 1/4 " Dog Dish hub caps perfectly. They have a larger than OE center hole, and 5 x 4 1/2" bolt pattern. I bought the wheels from Summit. They come in a gray primer, I had them painted body color, like factory.