I have a set. Have not put them on yet but there very light. Would only run them with a glass bumper. You don't need the outer mounts.
I only used the fiberglass front mounts. I actually didn't know they made rears. I used the factory 1 bolt mounts that are on each end of the bumper. I also made a bracket out of the 1/8"x1" aluminum for the center. So you only see 2 bolts on the rear, 1 on each end and the center mounted ones are behind the license plate. Let me know if you need any pics of how I mounted the rear bumper.