Remember Coach Saban said that there is no starting OL yet. From what I've read it is safe to say that the Center, LG & LT are positions are pretty well set. The RG & RT spots appear to be wide open.
LT- James Carpenter
LG- Mike Johnson
Center- William Vlachos
RG- Barrett Jones, Alfred McCullough & Chance Warmack
RT- Drew Davis, John Michael Boswell & DJ Fluker