NTG 2.5 Hard Drive Size

I guess your head unit is the US Audio 50? In any case if it has a cassette player, it would not be a simple plug-and-play.
It would have BT
It will probably answer your questions about going to the new COMAND.
https://mbworld.org/forums/e-class-w...ing-2-5-a.html

Your car is not the simplest one for NTG2.5 retrofit, it has a cassette player and it has an AGW at the trunk then (tuner, amplifier etc. at the trunk).
You should be able to use the same retrofit harness as for Comand (NTG1).



