Addco sway bar

The Addco bars point their ends at the lower shock bolts, and supply angle bracket "tabs" which mount there. That would have the early factory tabs too far outboard, and the later tabs too far inboard. You could either cold form (bend) the sway bar ends to line up with your tabs, or use the supplied angle brackets. You want the bar level and the links straight up and down with the weight on the wheels.

Although Addco doesn't really mention it in their instructions, their Erector Set bracketry can be greatly improved with a few tack welds once everything is lined up.