I live in the States and am looking for a Eurpoean number plate mount for w204 (2009 c300 4matic)
I've already purchased a European license plate and a frame. I just a need a special mounting base for w204's front bumper... I'm sure it's common in UK but I can't find anything here in States...
Do what BMW does on Euro delivery cars for the USA market.
Contour the plate or the plate and the plastic holder to your bumper.
Install it with the appropriate 3M VHB tape.
No holes to drill, VHB will stay "stuck", but yet can be removed without any paint damage.
Your dealer is correct as in the USA they only have access to the North America EPC and can't order Euro only parts..