Do you have this kind of "actuators" on top of your shocks?
You need 4 of this actuators (one per shock) to make your FX3 system work.
If you don't have them, prepare to spend a lot of $$$ ...
Shocks can be obtained at about 700 to 800 $ a set on eBay or in major Corvette parts suppliers.
There are 2 different shock types, from MY 89 to 91 and from MY 92 to 96.
Actuators are all the same for all years (2 fronts + 2 rears).