1957 The Crickets "Oh Boy" and "Not Fade Away" 45rpm

Both sides I would consider Hits, so I wonder which side was considered the "B" side. This is the 1957 pressing of Buddy Holly and The Crickets' hits, "Oh Boy" and "Not Fade Away" on Brunswick label #55035.

Quick listen links:
Not Fade Away - http://www.youtube.com/watch?v=m7iPbqNla6Q
Oh BOY ! - http://www.youtube.com/watch?v=BEuARL2OhJE