Re: Cowl tag X55 or X66
 

Finally realized that you are in Canada. Did you check with GM of Canada? If it was shipped new to Canada, they would have a record of the options for the car.
http://www.camaros.org/geninfo.shtml#MyCarHistory

Also, as someone suggested above, check for an X code on the rear bulkhead (trunk divider) behind the back seat.