The early amazon (and 1800) have a clip held held by one bolt (threaded into the body) that holds the sway bar. The later ones have two bolts. The larger sway bars that IPD sells, come with a clip for the two bolt set up and says to weld in a nut for the earlier body. Most installation I have seen, they simply drill through frame member and install a longer bolt.

I'm a pretty good welder but debating how to tackle this. Has anyone done this and been happy with it? Did you drill a hole from the top (big enough to get the nozzle in and weld the nut to the bottom, internal surface of that member)? Did you use a forstner bit to cut a plug out of the bottom surface, drill the smaller hole for the mounting bolt, weld the nut on the back side of the plug and then weld the cut out (with nut on the back) back into the member from the underside???