There are a handful of old truck canadian parts sources... there may be more, but these are the ones I have found out about:

http://www.midcanadaclassic.mb.ca/

http://www.scottssupertrucks.com/

http://www.ironchief.com/

http://www.antiquechev.com/

These links can also be found at my rinky dinky 'work truck like(read not fancy but gets it done)' hobby site:

http://woogeroo.home.mindspring.com/autolinks/trucks/ctgparts.html

-W