One of the common things I will look for is the modification to go from the Brit fire extinguisher to the ansul extinguisher. It required the welding of new blocks in the area of the front and the side extinguisher. Neither the Borden nor the Wainwright Ferrets show this modification. So while the rear plate of the Borden ferret shows the likelihood of being Cdn with the (easily drilled) holes drilled for Jerry can Brackets, it does not show the mods for the extinguishers.
There are other mods to look for, but neither photo shows the required areas clearly.
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