Hi,
I used the stock spring pad with the Eibach springs. After lowering the car, I took it to my local Mercedes delaer who ( fortunately ) has very up to date alignment gear. They aligned the car and I was good to go.
Unfortunately, I sold the 300e, but it looked really good after I was done with it. The Eibach/Bilstein combination worked great and I had installed 17" wheels from an E430 Sport. The Conti Sport Contact tires were quite good as well. I miss that car, but the C 43 kind of makes up for it's absence.
Regards,
Richard