How does one determine which of the 3 optional front and rear JCW Suspension RED Springs offered are the proper ones matched to their car with options?

And, how do you identify same for JCW Red "used" springs? Do the JCW Red springs have color codes? Stamps?

From MotoringFile "JCW Sport Suspension Official Information"
3 Front Coil Springs: 31 33 6 782 728, ...729 & ...730
3 Rear Coil Springs: 33 53 6 782 731, ...732 & ...733

Guessing the F728/R731 are the lightest spring rates of the bunch???

Considering for a base 2012 Cooper with BT & Armrest only.

 

The dealer will do this for you. Its based on your VIN.

 

Based mostly up tranny and sunroof, the correct springs a picked by the dealer for the cars weight...they use the vin. Getting the correct spring rate improves performance and ride. Makes on kinda wonder about aftermarket non adjustible products....