Anyone knows where to get bumper parts for 2006 ML350?

I have a 2006 ML350.
I got a damage on my rear bumper and I want to replace with the new one..
do you guys know where to get the bumper parts from internet?
Thanks for help!

Hello-
 
I know this is an old post but in case you are still looking I have dozens of the bumper covers. I understand that they also have a bumper insert? I will be getting the part numbers by the middle of next week when I get back from my cbusiness trip to CA.
 
Let me know the part number if still needed.
 
Thanks