Have you seen any differences in the center hole for fans? I always thought fans were all the same. My late husband had the fan (as well as other things) on his Tuxedo Park chromed. The chrome was not as good of quality as other parts he had done and was getting pitted. We bought another chrome fan on eBay some years back. When the person that's helping me tried to install it, the center hole was too small. Could it be for some other vehicle and someone sold it as this or would there be any differences? Would there be a difference between L-head and F-head. I've already discovered that carbs are different.