Right well I've purchased this now. It has 30 day warranty and I can also return it in person if it's the wrong one. It came out of an E Class W211, I watched it working and watched them remove it. However I was assured it was an NTG 2.5 and it has SD card slot, red and green call buttons and 6 disc dvd changer. The part number though isn't what you quote.
Part no is:
A 169 870 49 94
and it says Model no BD0811
It is manufactured 13/11/2008
However, it came out of an E Class 2003 so I can only presume this has been retrofitted to this car before it was involved in the accident???