I'm getting ready to replace a leaking transmission output flange seal, as well as a leaking differential input flange seal on a fintail, so I started searching for the special pin sockets that fit the special nuts in both of these locations.
Found that they are not available through Mercedes, or Assemacher, but Sir Tools does still make them.
Spoke with Mark at ZDMack tools and he's started carrying them as a pair and he's added them to his ebay store if anyone's interested in adding them to the tool quiver.
http://cgi.ebay.com/ebaymotors/Input-flange-differential-Axle-Tools-2-for-Mercedes_W0QQcmdZViewItemQQ_trksidZp1742Q2em153Q2el1262QQcategoryZ43998QQihZ008QQitemZ180219899568