Coilover spring replacement for shorter springs?

[broke30]

Hey all,
I have a rather vague question that I can't seem to find an answer for. I have an h&r coilover setup and for the rears all I have are the springs, no adjusters or anything and its honestly not that low, I would like to go lower. I'm not looking for "stance" or anything but I was wondering if you can buy shorter springs. The ones I have currently are eibach 550's from ground-control. Anyways, any input would be appreciated. Thanks!
Max

[whodwho]

They are probably 6" if no adjusters, you can get 5 or 5.5 in close to the same rate.

Don't find 5.5 but here are 5" you probably need adjusters

http://www.ground-control-store.com/products/description.php/II=299/CA=212