Comand = Cockpit management and display.
Its the Navigation+Radio+TV+CD unit from newer MBs, I think the one used here is either a W203 or a similar system from Becker or VDO Siemens.
I don't think its too difficult as the wiring on these systems are similar to the late W124 cars. There are Units that don't use D2B connections.
Would be interesting to investigate, it goes well with the W124 interior and has all the newer features