This is not the site I found the springs on although they have Ralliart springs for the Evo. I would question them before ordering though. (ie spring rate, drop, etc. - see if they can get the exact details from Japan, etc.) Then again, there is not much data around on them, a little risky. They seem way less than what I remember as well.

http://www.japanparts.com

Search for: Mitsu + Evo 8 + Ralliart - then go to page 3