Best bet would be to call Eibach.
What are you wanting to put them on? I ask because those are the springs I have to put on my 300 3.5L v6.
They are listed for the 300C but when I called them they told me that the 300's v6 & v8 use the same front springs. The backs are different spring rates the v8 is higher and they are 7mm longer. So I am planning on using bottom isolators in place of the tops in the rear. So we shall see how it turns out..
I didn't tell them thats what I was going to do, I am sure they would have advised against it