Welcome Aboard!
The Matrix and Maxspeed springs are cheap and they truely suck.
The last thing you want to go cheap on your Cobra is springs.
The Eibach Sportline springs will be the best spring for your Cobra by far! :thumbsup
You can get the Eibach Sportlines from
www.tirerack.com .
I think you mean "Caster Chamber Plates".They help to align your
car properly.Also it's a good rule of thumb to install caster chamber plates
when lowering your car.The best C/C plates you can get for your
Cobra is the Steeda caster chamber plates.You can get them at
www.steeda.com .Good luck Patlitus and let us know how it go's.