Mercedes coils will have the part number stamped on the bottom of the spring. The paint indicates whether the spring is short (blue) or long (red).

There are two sets of paints. One if the manufacturers and one is Mercedes. The Mercedes ones are either blue or red. We ignore the manufacturer ones.

The blue/red color is used to determine which spring pad is to be used in combination with the point system.

I've been though all of this so I pretty much know all about the spring/point/pad system lol.

I've got some screen shots from the FSM in these threads (126)
http://www.peachparts.com/shopforum/diesel-discussion/284679-paint-markings-springs.html
http://www.peachparts.com/shopforum/tech-help/340822-w126-420sel-ride-height.html

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