With the rear suspension in our cars, the damper and springs are seperate.

I just bought a set of Cusco Zero GT's, havent fitted though...

http://www.cusco.co.jp/en/whats_new/...ver_kitgt.html

That's the site, and as you can see it is only used outside of Japan. These are the fully threaded types. You will need to use your OEM top mounts. With Buddyclub N+ they are fully threaded and have top mounts included, but I get the impression that they are too stiff for street and you will be wasting them if you never go to the track. Tein SS are not fully threaded and I think are the most expensive out of the three.