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Boss Spring Rates

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Couple of questions on spring rates

- Are the OEM spring rates on the Boss linear or progressive? I see that the Ford Racing "P" and "K" springs are linear for the front and progressive on the rear.

- Does anyone have the OEM spring rates for std and LS Boss's?

Thanks
r/
Eric
 
I believe the P and K are the same and are equal to Pro-Kit and Sportline respectively.

http://www.cjponyparts.com/eibach-lowering-spring-pro-kit-set-v6-gt-2011-2012/p/EBS18/
 

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