Does anyone know the spring rates for the Eibach Pro-kit springs. Courtesy Parts gives them for the 300ZX kit, but for other cars they only tell you the drop.

This is the page from Courtesy Parts:
http://www.courtesyparts.com/onlines...2_nismo_eibach


Also, the front maxima Eibach springs don't look progressively wound, only the rears do. Does this mean the fronts are a single rate and just the rears are progressive.

Appreciate any info you can provide.