Canadian cars usually have a wider larger core. Same box can be found in 63/64 fulsize GM. as far as i know 1967 used the smaller core, all will work, you just need to match the core size to the box.
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Beaumontguru
MY BEAUMONT HAS 4 STUDDED TIRES AND 2 BLOCKHEATERS......AND LOTS OF OIL UNDERNEATH. The other one has a longer roof.