Mobil ATF 3353 and Shell ATF 3353 are both listed in WIS as compatible alternatives to the factory ATF. They'll work on 722.6/9 transmissions.

I don't belive Mobil makes a version of the 3353.

I just though it interesting that Fuch's also designates it MB factory fill stuff as Dex III compatible.

Maybe they don't, but FWIW, MB has it listed by name on their approved service products list.