We bought a standard strap-type mount from David Allen Racing (right next to the entrance to the ORV area) for my brother-in-law's WJ last summer. If you fish around up underneath the bumper there are a couple of holes in the sheet metal supports. The holes we found were smaller than the standard 1/2" bolt they usually sell you for the flag brackets, but DAR had some smaller hardware available. We got his mounted in about 10 minutes in the parking lot with basic hand tools, no drilling required.
Paul - 2005 Wrangler Unlimited