I installed the eibach pro kit on my car a little over a month ago and just recently go 19" wheels. Yesterday I noticed that the driver side wheel well clearence looked a little high. I measured the difference between the passenger side and driver side and found that the driver side rear is almost 1 full inch higher.

Any ideas on what could be wrong?

 

the spring could be positioned wrong on that side

 

That's the only thing I can think of... I crawled underneath and it looked like it was right...

 

Call Eibach. I had a fried have the exact same problem you did on his car (it was a spring in the rear on an Eclipse GSX though). He reinstalled it 2 or 3 times just to make sure, and never could get it leveled out. (He eventually replaced the springs with coilovers)

 

The thing is so many people have installed the eibach pro's that it's either the spring or the installation... My guess is the latter.