Well guys, I got em! The dealership didn't have a key to fit and wanted $100 to remove them with no guarantee of not damaging the wheels. So I decided to give hammering a socket on one more try. The 21mm spun previously and the 13/16" didn't want to go on, but with some persuasion from a 3lb sledge, the 13/16" wedged on there! Once on, it broke the nut loose no problem!
Moral of the story....use a bigger F'ing hammer!
Moral of the story....use a bigger F'ing hammer!