Short answer, yes, you can order parts.
Start here--it's a bit of a PITA and you have to go through the diagrams (the "trick" is finding which category really applies to what you're looking for since they're not intuitive).
Then order from your local stealership or buy from Tisher or BMWpartz. Beware of shipping charges on the online route, what you save on small parts can be eaten up by shipping costs and sometimes the stealer is the better deal.