I have had no luck finding chips or codes for Canadian trucks. The color on the firewall in the following picture is original paint and according to my resto pak from GM Canada it is called #237 - Airway blue.

http://rides.webshots.com/photo/1377804495023244788GDMSlN

If you want a resto pak for your truck here's how:

http://www.stovebolt.com/techtips/GMRestoPak.htm

1952 1300 Canadian 1/2 ton restomod
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