Usually drivers side slightly longer as vehicle often driver only so compensates for that.
 
See this from RAVE in relation to spring colours and fitment.



I believe that the different lengths only apply to front springs, according to RAVE.

Tony
 
See this from RAVE in relation to spring colours and fitment.



I believe that the different lengths only apply to front springs, according to RAVE.

Tony
I've just checked the new springs I've ordered for the rear, and they are actually the same size (uncompressed), even though they both have differing part numbers as obtained from Allbrit - RKB101101 (RH) and RKB101100 (LH)
 

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