I've never seen one before & this might be of interest to someone. The Australian versions of the W126 only have self leveling on the rear. This one appears to have hydropneumatic suspension on all four corners & looks like some parts are the same as those on the 6.9.
Note I have no affiliations with the seller.
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=320605896549&ssPageName=STRK:MEWAX:IT
http://cgi.ebay.com.au/ws/eBayISAPI.dll?ViewItem&item=320605896549&ssPageName=STRK:MEWAX:IT
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