Don't you think it would be good to group all Corvettes together? I see some listed as their own make and some as a model under Chevrolet. AFAIK, they're all Chevy Corvettes.
http://www.gm.ca/gm/english/vehicles/chevrolet/corvette/overview?adv=86666&k_cli- ckid=14480179-8e9b-56a9-eb8a-000029c8b5d0