[W126 Coupe] Bilstein Shocks

[Robert Karl Stonjek]

Hi gang,
I've been reading through the archive and find that Bilstein HDs look like they might be the right shocks for my car.  On the Bilstein site, however, they only list two shocks for the 560SEC (1987 220kw):
000412, Bilstein - B4 Gas, B36-1183 which I take it is the standard unit and
002180, Bilstein - B4 Gas, B36-0501 which I assume is the harder shock.

Is the 2180 the same as the Bilstein HD mentioned in earlier threads?  Which is the significant number one uses for ordering?  Note that I am writing from Australia where Mercedes are in the minority, 560SECs reasonably rare (I've only ever seen one other 560 coupe).

Thanks,
Robert
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