Hey Gizmo...The auto may have been once but yeah engine no is incorrect. Both serials belong to either late model 5 s2 for the ac and model 5 s3 for the 1aaa. Id buy the auto for 30-50 but not the other one...I love the look lols,rotomo top hat and even a scott.bonnar 35 front wheel and a really nice lean lmao...good spotting gizmo