Here's the nerfs. They're pretty simple and cost $175 from Souk thru BW Motorsports. Souk mentioned that Brad at BW is losing his guy who fabricates these, so it'll be tough for him to source more.
The first pic is the rear nerf. As you can see it's basically a piece of angle steel with the ends "radiused" with a cut piece of steel welded into the angle. The front bumper shocks are used at the rear due to their shorter length. You can either drill holes in the angle or weld to attach the nerf to the bumper shocks
The second pic is the front nerf. It's already got "shocks" built into it and it's mostly a straight bolt-on. The front nerf I have was a bit narrow so I had to spread the bar out a bit. I just stood on one end and pulled up.

The fact that I could open the bar up a bit to get it to fit tells us that these nerfs obviously are only going to provide protection for light impact on the bumpers. Any sort of crash at cruising speed and these bars aren't helping you much......