I bought the 501x springs for my 201 (53974 & 53975). These are marked as red, yellow and blue (soft to stiff) for both front and rear.
i'm pretty sure the 201 front spring set (54221) includes brown, black and green springs... So not sure what ones you have...
Perhaps this spring chart can help you?
http://www.petitrc.com/reglages/BuggySpringChart.pdf