I've been thinking about this as I have just bought a set of springs for my 210 wagon also. Put the front springs on and see what happens with the rear. If it does nothing I will put the rear springs on, but I like the rear a bit higher than the front, and I just put the fronts on my 95 wagon.

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95 SL500 Smoke Silver, Parchment 64K
07 E350 4matic Station Wagon White 34K
02 E320 4Matic Silver/grey 80K
05 F150 Silver 44K