Complete bolt-in rear coilover includes everything except the bottom bolt/nut that is on your car now. From bottom to top:
Koni shock (internally adjustable for rebound damping)
GC sleeve and locking collar
GC 300in-lb 8" spring
koni bumpstop
GC tophat
rubber washer
Motivational rear plate for additional travel
Homemade gasket
ribbed washer (not visible)
top nut (not visible)
click on picture for bigger version
I recommend putting a stack of metal washers between the ribbed washer and the topnut and tightening the topnut as much as possible. I did this and it was quiet. However, I used to washers for other things and you need to get your own.
$300 shipped, USA 48 states. Higher elsewhere.