VW T28 Rear Springs Upgrade

That makes sense, thanks @Skyliner33
So what would be the stiff code or is there somewhere these are explained cos I've never been able to find anything.
 
 
There is a different one, where someone was putting together a list of all the different paint codes on the springs of each variant.
 
IMG_20200313_090042.jpg
So what is the difference between 3 grey and this 3 X blue and a green?
 
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