Note that the U.S. restoration packet will not give specific information about your particular car but will give you generic information covering your model/year.
Still a very valuable tool especially for the price of a stamp or phone call.
If your car is Canadian built, contact GM Canada Vintage Vehicle services. In Canada, 1-888-467-6853 (8:00 AM-5:00 PM Eastern time) Outside Canada, 1-905-644-3387 or 1-905-644-4060. Unlike U.S. restoration packs, GM of Canada charges a fee for theirs however, Canadian restoration packs come with specific information for each particular vehicle. Vehicles 1963 and older are $25.00. 1964 to current are $45.00. (Canadian dollars)