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The budd bevel is a straight bevel and the nuts have a curve. Apparently it works fine, they certainly center the hole and the nut doesn't bottom out...so all is well.
I doubt that it matters that the bevel is conical, not straight. These are for the Alcoa aluminum wheels, which have more of a ball and socket mating surface...but appear to do the job. Have you checked them for wear after using them a while?