front bumper insert
From that page, click 'J J Bumpers 2006 Catalog'. The catalog comes up in Excel spreadsheet form. The w208 bumpers start on line 5286. The part I believe you are referring to is called the 'crossmember' ($128) there. Call to make sure it's what you're looking for.
Anyway, when I took it to a place that does all the bodywork for a local Mb dealer they said the insert was only $70. Not sure if it was painted, i would think it is.



