[bobcowan]

Looks like a rear mount. The stock piece from FFR is pretty well known for breaking, too. I wouldn't waste money on it.

On my car, I tossed the supplied part in the trash, and made my own out of 1/2" x 3/4" alum bar stock. I drilled and tapped two 1/4" holes towards the center. Those holes match the FFR holes that FFR drills through the trunk deck. I ran two bolts from the inside of the trunk and into the bar. No reason you can't do that on your car.

Towards the ends of the bar I drilled and tapped two more 1/4" holes. These match the license plate holes.

The plate had been mounted that way for years, with no evidence of ever coming loose.