In regard to the Canadian turrets in Australia, this comes second had from someone who was an army mechanic working on tanks in the Australian Armour.
Seems that a few years ago Canada reduced the number of tanks they wanted to keep in service. The turrets were purchased from these surplus tanks by Australia. They were then used as part of an upgrade programe that was being carried out at the time.
Part of the reason for the upgrade was that when operated in the tropics temperatures inside the tanks was constantly over 50 deg. The doctors said that you could not support life at these kind of temperatures. As they were moving half the tanks to just south of Darwin this was a problem that had to be fixed.
These are of course second hand stories that I am sure can be corrected by someone with a source closer to the decision makers.
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