So someone decided to break into my brothers car and steal just the faceplate of his Avic-u310bt. Can I just by a used one off craigslist or ebay and be good to go or does it need to be programmed by pioneer?

Thanks.

Yup, any faceplate will work, obviously the same model. The firmware gets updated in the face as I've tested it so whatever the face firmware has its what the radio will show as the version. You can buy from ebay or Pioneer.