The magnesium 200s wheels had a problem with the center breaking out. This caused George Follmer to crash into the pit wall on the last lap of the last 69 race. I don't know why they ran Minilites and 200's at the same time. It may have been due to wheel availability. The Fords ran a 5x5 bolt pattern up front and a 5x41/2 in the rear due to the Lincoln front brakes. Here are some pictures of a 15x8 magnesium 200s that I have. It is rumored to be off of Revson's car. They have a 4-69 date on the back cast in.