noidea - Best contacting a dealer direct - I'm sure someone will offer to send. Especially as BMW Direct are on eBay.
markridoo - Ordered the bits from Williams BMW. The whole bumper had to come off to add the single silver strip (needed a hand lifting off so not to drop).
Yes, the black mesh needs changing too.
If you are not changing the bottom silver bit you'll need to file a little of the new grid as they've offset one of the catches by 10 mm to make it a little different.