That one is a TechniSat/Preh unit. A Delphi version's sticker looks like this:
View attachment 301450
As I am not particularly familiar with TechniSat/Preh, I don't want to give you incorrect information on patching those units. Also, as a correction to my earlier post with part numbers, it looks like 3Q0035864C does not have DAB, so I would exclude that from your search. If you go the Delphi route, you may have to update the unit's software train before patching.
If you source a unit from a different vehicle (e.g., a Polo instead of a Golf or something), you may need to make minor coding changes to the unit with a scan tool. You can also find other useful info in the
MIB1 to MIB2 conversion thread.