[DesertMK4]

Springs are normally labeled with their spring rate (i.e. the amount of weight to compress the spring 1 inch). On an assembly line colors are used. A given model of car get blue springs, the big engine car gets red springs to off set the increased weight of the big block. Without knowing the maker of the springs I don't think there will be any universal color code. A Ford red spring does not equal a BMW red spring. One more small point: there are not enough primary colors to code springs. My Eibach springs came in rates from 250 to 650 in/lbs. The part number on each spring ended with the spring rate as the last three numbers. The springs came in only three powder coated colors: red, yellow and black. By the way I reduced the spring rate front and back by 100 lbs.from the FFR rates and have loved it ever since. Hope this helps.