Date registered: Oct 2007
Vehicle: 30+ mercedes and a suburban to tow them
Location: Long Island, NY
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it was optional on all sorts of cars. The 6.9 had it standard of course, but the W116 and W126 cars had an optional full (4-wheel) suspension. The W114, W107 & W123 cars could be ordered with the rear-only set up.
BTW, to the US member that asked about this car being grey market. The owner of the car is in Australia, so the answer to your question is "yes".
The import of spheres to australia does run into some hazardous substance transport rules because of the pressurized nitrogen present. I have heard the question asked before, but don't recall the solution. Ron Bunting would know.