Here's a Smittybilt bumper I purchased that was designated for a Jeep JK (07+). I had a local offroad shop (richard @ Atomic Motorsports) fab up some mounts that duplicated a JK's frame horns. These were then welded onto my frame to the top, bottom and sides.
Onto the pics:
Drivers side angle of the welds:
Lower mounts. Richard added these additional mounts on each side, stock the bumper didn't have these for support: