They are not the same as avantgarde ones on any W211
I've been looking for an age. You can obviously get them new an unpainted but they are £600 plus and I can't justify that expense to myself.
In a few years of looking, I've only seen 2 sets on German eBay, and I passed on them as they were the wrong colour and in the expectation that something else was bound to come up...which still hasn't happened.