Trying to upgrade my 98 E320 with a navigation unit. I was able to find a double dinn wood trim piece from a 2000 E320 that matched my trim but it has one extra button slot above the command controls. Few questions:

Can I get a blank / place holder button for this extra spot? Mercedes of San DIego parts guy said no.

If I can't get a blank button can I add some sort of option to fill up this spot? If so, what would be the cheapest? I currently have door lock, hazard, and head rest buttons above the command.

I believe I also need some sort of chassis to hold a double dinn unit, does anyone know what this part # is and / or how much is costs?

Can I keep my stock bose amp and speakers when upgrading to a double dinn unit?

Last question, is there anything else I need or anything I should look out for when doing the upgrade?

Thanks in advance for any help or suggestions...

 

There are blanks. Steve at mbenznl.com can probably get them, and the chassis, and the other components (you need the GPS antenna, too). You can keep the Bose components.