What separate components need to be purchased to make this conversion?

 

You can order the springs and the rest of the kit separately, but it's really designed as a kit and usually purchased together. There are three different springs and the right ones for your car are determined by whether or not you have certain options. I believe the kit comes with springs, dampers, and sway bars and a few accessories needed for everything to go back together separately. Hopefully that answers your question =)