I have only investigated rear shocks. Technically they are different part numbers for the original equipment.

In the aftermarket: Bilstein lists different part numbers for w123 and w126, however Bilstein prides itself (i.e., claims) that it valves shocks to each individual application. So it would make sense they have different shocks for each.

I found that other aftermarket suppliers I looked at (Koni, KYB and Monroe) list the same part number for certain applications on both.

That says they should fit. It does not guarantee you will get the performance characteristics you are looking for....

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Mac
2002 e320 4matic estate│1985 300d│1980 300td
Previous: 1979 & 1982 & 1983 300sd │ 1982 240d

“Let's take a drive into the middle of nowhere with a packet of Marlboro lights and talk about our lives.” ― Joseph Heller, Catch-22