I am trying to add aftermarket 57 Lancer hubcaps to my 56 Buick wheels. I noticed that the valve stem hole in the hubcap is in a different location on the Lancer cap than the Buick cap. I have a set of Nash caps and they have the same location for the valve stem as the Buicks. I also checked them against my universal fit 40 Ford style wheels and they match the Buick and Nash caps. The Lancer caps valve stem hole is about 1" more towards the center of cap. The Buick valve stem hole is about 1.25" from the outer edge and the Lancer cap is 2.25". Both caps are the same diameter. I cannot imagine that I am the only person to have this problem, nor can I imagine that everyone who is running these caps have Lancer wheels. I am guessing there is a simple explanation for this. Any help would be greatly appreciated.