This video contains both the 1956 GM production vehicles (Corvette included) and several Harley Earl designed concept vehicles including the Firebird II
http://www.archive.org/stream/Designfo1956/Designfo1956_256kb.mp4
But I doubt this sold many Corvettes
http://www.archive.org/stream/Designfo1956/Designfo1956_256kb.mp4
But I doubt this sold many Corvettes