Update
Thanks to Mark, I called the Canadian Border Services Agency today and was told by two senior officials that ... YES ... you DO NOT have to pay duty when you import a car that is 25 years or older.
If you have already paid duty when importing your cat (like Doug and I did), you can make an Adjustment Request using this form:
http://cbsa.gc.ca/publications/forms-formulaires/b2g.pdf
Just photocopy your Vehicle Import Form and your receipt for the duty paid (the blue Customs form) and send it off.
I will let you know how I make out ...
Thanks again, Mark!
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