Don't know. But I did mount a Rubicon skid on my sport S. There are metal "horns" that attach to the down-members of the frame. I got those with my skid plate. There are special hexagonal nutserts and bolts that attach the horns to the frame. I had to order those through a vendor, the Jeep parts store wouldn't sell them.
Then, since I had an after-market bumper, the holes in the skid did not match up with anything. I used some metal strapping and bolts to tie them together.