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Demort said:The colours denote suspension type .. sports etc or the vehicle they are fitted to .
Cant have a black dot on a black coil so perhaps one of your dots have rubbed off ..
A few examples here if you look at item no. 7 ..
http://www.deroure.com/diagrams.asp?TBL=2586&MAK=3&MDL=25&SMA=0&SMO=0&ST=&SC=0