Say what? Last I heard, you only need them for the front.you only need them for the back.
As for the original poster's question, you may or may not need them. The Eibach springs only lower the car 1" to 1.2" which is not enough to cause a major change in the geometry. What will change significantly is the toe-in, so you must get an alignment done. If the shop doing the alignment cannot get the camber into spec that's when you need the camber bolts - one for each side at the front of the car.
I lucked out on mine and the shop was able to get the alignment without them. He did use a spreader tool to force all the slack in the mounting bolts in the direction necessary to get the right camber.