Don't know where that picture came from but that is the correct part #. Here's some more pics.
1- front of the package and the mount minus the screws. Seems I lost them!
2-Back of the package showing the mounting. I use two on each wheel pant but the axle only fits into the second wheel pant mount and not all the way through the wheel pant to the outside.
3-close up pic.
Probably wouldn't hurt to add a little extra fiberglass inside the wheel pant for a little more support.
Hope this helps.