Check it out....

http://www.fordaccessoriesstore.com/fas/consumer/FAS_ProductDetails.asp?PartNumber=5C3Z1007TA&oid=2886&sOldOid=2840&detail=yes

Ox,
are you planning to convert your GMC to a Blue Oval??? What center caps do you have in mind?

If only they fit..........

they had some on ebay and they was the harley edition...