Technical Strut coil spring color code?

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Hi,
can anyone explain abt the front strut coil spring color code? I have a fiat uno 1.7D , the driver side spring is week, the car now seats on the rubber buffer (the one on the strut shaft), mine is color coded yellow and white, should i replace with the same color coded one ?
what is the color code for a petrol uno?
please help

 

[edessex]

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