No I don't think its about cutting. I think its about ratings and such, I saw some stuff in the FSM about different colors but nothing about combinations of colors.

The EPC only lists one part number springs for the 300SD.
Hm, the part number on the front spring doesnt match up for an SD...hmmm

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82 300SD 145k
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89 560SEL 118k
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91 300D 2.5 Turbo. 241k
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93 300E 195k