Well on top of what jmiller said, you should get better answers to your suspension questions here in this forum.
But yes, you will need new bushings and it might not hurt to replace your endlinks while you are at it. Also, be sure to properly grease the new bushings if they require it.
All in all, this is a pretty easy mod and it should make a noticeable difference.
CFM, has the bushings and end links (available else where too but they come to mind first.) You should be glad that you have an SES with the mounting points on the rear sway bar, so annoying for us without that!