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Neither wheel diameter nor bolt pattern matter. The only thing that matters is the diameter of the raised circular bead that the dog dish cap snaps on to. There are 9.5" versions and 10.5" versions (and some later wheels with no such bead).
I missed the little "dog dish" thing and was thinking about full wheel covers.
As an aside, GM full wheel covers for the same size wheels with different bolt circles will not interchange either (ie: wheel covers for 15" wheels with 4¾" pattern on 15" wheels with 5" pattern).