7" C channel hear too. I was going to use the wedge washers like Kwai suggested and bolt it on but ended up welding everything together. Even with my booger welds I don't think it's going anywhere.

Another section of the C channel between the frame rails for the winch to perch on. 12k Harbor freight winch.

It looks bigger from the angle, width is the same as the fenders.
IMG_20160930_125658936 by kerry walker, on Flickr

Pilfered some old roller mounts from work and cut them down to make bumper mounts for the bottom and some 1/4 angle from the winch plate to the back of the bumper. Shackle mounts are bolted on in front of where the angle is welded up. Then bolted the stock "bumper wings" back on. I don't know what those are really called... they make a good place to put my tools or coffee cup when I'm working on the truck though.

IMG_20160922_165324877 by kerry walker, on Flickr
IMG_20160923_103149638 by kerry walker, on Flickr
IMG_20160924_084726429_HDR by kerry walker, on Flickr
IMG_20160924_121519688 by kerry walker, on Flickr
IMG_20160924_163835729 by kerry walker, on Flickr

It's pretty tight in there, shoulda moved it out a hair farther. I gotta keep the cable neat or it'll rub on stuff while it's rolling up.