Front License Plate Mount

Can anyone tell me the hole spacing for a front license plate mount where it mounts to the bumper?

Approximate center to center (within an 1/8 inch or so) and the diameter of the hole or just what size bolt it takes.

Matt the holes are in the top edge of the bumper about 1/4" in from the back side of the bumper and 5/16" dia. The hole toward the center of the van is just to the right of the inside edge of the bumper support and the holes are 7" center to center.

Thanks Mike! Working on a little something for that spot! Do you happen to know a typical plate length and width? Are they 5x10?

Plate overall size is 6" x 12" and the holes are 7" apart, like wideload said. I need to find something to back my front plate, the airflow around the front of my van already destroyed one of the paper thin plates the state is handing out these days. For now I have the new one sitting in the front windshield and the old one in the glovebox for when someone questions me about it not being properly displayed.