I picked up a used set of eibach springs, the front ones (part # 3510.301) are the right ones for a 1.5" drop but the rear are a different part number of 3514.402, i looked the rears up and its for a convertable!! Does anyone know if they will work on the rear of my car for a 1.5" drop???? Please help, im stuck right now, ebiach is of no help!!!!

 

no one knows anything???

 

i put the springs on the rear and it only dropped about 3/4 of a inch but now the rear of the car is bouncy??? Is it supposed to be like that? I thought it was supposed to b firm.

 

I love your picture on the left.
Anyways, once the springs settle you will probably have a 1" drop. As far as bouncy, are you sure you lined them up properly? You're right they should be firmer then stock. Compare the instructions on this link to what you did. The link is for Steedas, but the installation procedure is the same.
Spring Installation