Coil Over Rear Spring Rate

[Zman]

I am looking to go with Red 9 coil over in the front but wanted to know what folks do for the rear. Simon indicated he did not know what folks were doing for the rear but would be glad to help.

I have read several of the threads and seen many that have gone to coil over front kits and some rear. I am looking for the spring rate for the rear to replace the torsion bars. Anyone have suggestions or have their spring rates on a kit they have purhcased? I have access to coil overs but need to know the spring rate and then probably what overall length to purchase. Simon evey said if I could get the spring rate he could help me. Any help is appreciated.