This could be a tough sell but I'm going to try anyway.
I have a set of Camaro KW V3 coilovers (height, compression AND rebound adjustable) which have been modified to fit the G8. By modified I mean a custom spring hat was made to fit a Super Pro strut bushing and I used the Camaro spindles. The rear coilovers have ~500 miles on them while the fronts have several thousand. I bought them used and the PO let the springs get wet, hence the paint flaking off them a bit. They ride great, just a bit too low for my taste (two finger gap from the wheel to fender). You can go a higher, maybe 1/2" or so?
This coilover kit is a direct bolt in for the Zeta II swap. You will need 2010-15 Camaro front spindles, radius arm, LCA and a tie rod from a 2002 Camaro (if I remember correctly). You don't "need" the rear cradle. The rear spring hats would need to be changed back to the G8 version.
Price is $1350 plus shipping. You get everything you see.