I looked at the ones on ebay. It just seems wrong to not put an OEM fascia on a car like an M5. If there were a tasteful aftermarket front to put on, then great, but so far it doesn't look like there is one.
Plus, and OEM front isn't that much, plus painting will cost the same either way.
The trim is part of the bumper. This is not a part from BMW but from Raceonusa.com. I bought it as a spare for track days and whatnot, but never used it. It does require drilling the holes to fit, but otherwise should match up nicely. $100/obo plus shipping.