The current spare tyre is 153.81mm larger in rolling circumference, whether it will clear the wheelarches i don't know, i wouldn't run such a different size.
If the dealer doesn't want to make things right....and as above i personally would prefer a full size sapre wheel, not one designed for a wheelbarrow....then your first job is to check see if the wheel fits, which somehow i doubt, i imagine it's been swapped at some point for any old wheel lying round, if it does fit, make sure the wheelnuts are suitable too....some cars have much longer wheelbolts for alloys and in some cases using those bolts on steel wheel will cause brake damage (MB rears for example).
If no joy then get yourself a full size wheel from a scrappy, alloy or steel for your car, and make sure to grap a set of bolts if it's a steel just in case.
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