It's a 705 Lola bumper. I cut the knobs off of it, bolted it belly to belly to the 710 lower bumper, drilled the holes for the screws (I replaced with titanium) and Dremelled the bottom for the screw heads to fit. Have not tried it yet, but cutting up the front of the body will give enough room to fit on the body posts correctly. If you cut the bumper just inside the body line, then it would be ROAR legal.
jack