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It is not uncommon to have a different sized spare, but as Rob says, the important thing is that they have approximately the same diameter (assuming the spare is not a 'space saver'). Looking on a website which lists wheel fitments, the different sizes for a Fiesta of that age are, 175/65 x 14, 185/55 x 15, 195/50 x 15. There are more sizes for bigger wheels but i am assuming your spare is smaller than what is on the car. The sizes i have listed all have the same diameter to within a small degree, so as long as your spare is one of those, there will be no problem using it, but only as a spare wheel, not permanent. I say that because using different size tyres , particularly on the front, will cause erratic handling. This will only be exacerbated if you are a 'press on' driver. So if you are using that tyre, make sure it is only temporary till you get the original fixed or replaced.
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