Back Up Camera...
What you want to get is the Bosch Park Pilot system with the correct wiring harness and install kit for the W463. Bosch USA won't sell you the parts because they are considered OEM only, but I have been able to order them from a Bosch dealer outside the US.
I saw a G55 AMG in the Middle East last month and it has the exact same electronics as shown on the Bosch Park Pilot system. I'll let you know once I get the parts. They were pretty cheap ($350).



