rear springs?????

[small_m]

I am looking to lower my car. I am running z3m springs on the back and could do with being just alittle lower. My issue is I have an M3 swap on the front end so i am running m3 struts and springs. I have lowering spring for an M3 but of course only the fronts will work. So where can i get only rear lowering springs from? And what would be a good spring to lower a little more than the Z3M spring as i have no reference to how hi the standard ti spring is...
Thanks

[SDKmann]

I have no idea if they will be lower and not 100% sure if they will work but here are a set of E30 M3 rear springs for $20- http://forums.bimmerforums.com/forum/showthread.php?t=986782&highlight=E30+M3