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The heat will transfer through the casing a lot. Then you have the different CTE between the metals. It cant contract with temperature, it just wont expand as much if the outer isnt able to move (not as hot).
No, it's not increasing and shrinking at the same time.
http://physics.bu.edu/~duffy/py105/Temperature.html#:~:text=So%2C%20with%20something%20like%20a,same%20material%20as%20the%20hole.
The ones from Ebay are now about 120quid unfortunately.
Pretty self explanatory when you're there for changing the rad, but I'm sure theres guides and also some photos in my thread.
You'll be able to get them from renault, but I'd just measure the hole size and buy a pair of universals on ebay and replace both sides. Seal them in with tiger seal as they're prone to leaking and youll be grand