A MB dealer in the US can get about anything overnite. I have gotten parts through my local dealer from Germany in the same week. Almost everything I order comes overnite even if it doesn't come from our local depot.
One of the most despicable practices I see is to make a customer wait so that they can get the extra 10% off that comes from waiting for a stock order.
Bosch Master, ASE Master, L1
33 years MB technician