m030 spring rates

[autodoctor911]

I want to upgrade my stock springs, and must use other stock springs for racing class. how do I find out which springs are the stiffest, and what hieght they will be? does anyone have ROW m030 springs? what are the color codes on them? are they the same as USA mo3o color codes? USA is yellow/white front, but two different part #s for -02 and 03-. the rear gets really complicated, as it makes a difference which transmission and which engine. the rears seem to be:
base, 5speed:
-02 red brown
03- yellow brown
base, automatic:
-02 red white
03- yellow white
3.2 6speed:
-02 orange brown
03- orange brown(different part #)
3.2 auto:
-02 orange white
03- orange white(different part #)
and they list another 3.2 no trans specified 03- violet white
I want to end up with the stiffest possible rear springs and stock ride hieght. and have the front springs be about 20-30% softer. is there any way to find the specs on all these springs from porsche?