IIRC for 05+ GMM Ripshifter underneath, B&M top only.
Almighty:
Bushings are the weakest part of this car. To tighten up suspension, replace about $500 (DIY) worth of bushings/mounts and you should be good to go.
You should look for a 2005 and see what kind of price you can get. Very minimal differences between the 05 and 06.