Someone got a killer deal on the ones off my wagon, 4 of the 5 1/2" ones and one 5", all were original to my 61 Meteor wagon. Not just HiPo cars had them, the wagon sure isn't a HiPo.
The small rounded holes are the giveaway to spot them, normal wheels have a more squared off opening where the metal is folded over to make a flange. The HiPo wheels are just a cut opening, easy to spot when on the car.
The center hole is about 2 1/2", it doesn't fit snug to the hub like normal Ford wheels.