Navagation SD Card,
I purchased a C300 4matic with the Nav system pre-wired, MB wanted $600.00 for the sd card, I found one for $170 but the version was not right? MB gave me a part # A2139063705 but the only place to find this number is MB @ $600.00. does anyone know what Number would be the same on the open market? NEED HELP PLEASE! MB of course is not helping...