has anyone ever installed the eibach springs that were made for this car? if so, how much did it cost to install? i went and got quotes all around and everyone is coming out to 300 - 500 bucks just to install these springs. freaking cadillac dealership wont even install them for me. everyones reason is because the never worked on a cadillac before so they go and jack up the prices. i tried installing them myself but its impossible because you have to separate the frame from the body.

so does anyone know what to do?

if not, im prob just going to sell these to some person that can find a good deal on the installation

Every location is different - but try a Midas dealer. Where I live they do many special items for me - they don't quote for these special items - but try and give a realistic $ guess - then charge me only the time they did the work.
Changing the rears should be no big deal, the fronts may take more time if the need to seperate a ball joint from a control arm. I would love to hear how it looks and rides if you get it done.