Rallye Center Cap Stuck

I've got a tire iron but I can't get it on far enough because it hits the caps. I can only just get it over the nuts but can't get any torque on there or it slips. I'll try it with a socket though if I can find a 13/16". I think the tire iron just has more material around the socket so it can't fit in the hole in the center cap.

I am apparently not mechanically inclined today, already broke something at work too.