According to this chart, the W126 trailing arms for the 126.039 are interchangable with the W123 trailing arms.



The curious part is that the 126.039 is a 560SEL, which does not have the same trailing arm as any W123 or W114/115 I've ever owned....

The 560SEL, and I suspect, the 560SEC have a forged or cast light metal (magnesium?) arm, which if this chart is correct, would be a direct sub for the rust prone stamped steel type.

It would seem worthwhile to seek out a set of these arms, if indeed they interchange directly....

Euro 500s also have 560SEL style trailing arms.

Jim

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14 E250 BlueTEC black. 45k miles
95 E320 Cabriolet Emerald green 66k miles
94 E320 Cabriolet Emerald green 152k miles
85 300TD 4 spd man, euro bumpers and lights, 15" Pentas dark blue 274k miles