Did the Addco come with any long bolts, spacers, urethane/rubber donuts, cup washers and two short pieces of angle iron (one hole would be about 1/2 inch and the other about a full inch on each one)?
If so, then that's what they want you to use. The angle iron will mount to your lower control arm using the lower shock mount bolt, and you'll use the long bolts, spacers, donuts, cup washers, etc for the end links. The saddles and saddle cushions should go in the same place as the original ones.
I just googled the Addco sway bars and came up with generic instructions at this site: [size=78%]
http://www.addco.net/[/size]
I also have printed instructions/drawings for installation, but I don't think they're any more specific than what you'll find on the Addco website.
I hope this helps.