Hickwheeler,
The Explorer Pro Comp 2.5" lift for Sidekicks and Trachers was discontinued years ago. You can occasionally find one used on line. I have owned one of their Kits and would HIGHLY recomend buying a Clamini over the Pro Comp lift. The Calmini 2" lift gives you almost the exact same lift, it is easier to install, and rides much better.
Zig