I'm in the process of replacing both OEM bumpers and using POR 15/paint on the frame. As I was applying the POR 15, I saw the two holes that I have always wondered about - the two that are forward of the top edge of the rear bumper and in the lateral center of the cross member that runs under the top edge. I'm guessing there was a non-US option that bolted there - a different bumper style? Not a earth shattering topic - just curious. Anyone know the answer?