I have read 1 post on this some time ago. who makes the springs. Ours seem rather straight still, been on since the Jeep was about new. They are Ave springs that at the time were made by eibach I believe.Not sure of the newre kits unless they started painting them black as ours are a grey.The only good thing about ave is the springs.....
I do think that if anyone removes the springs they will see a curve in them.