It won't cause any damage as such, though arguably if it was on the font it would make the diff work slightly harder on a long motorway run, again the chances of damage are slim.
I wouldn't run the car with odd sizes though, its probably nickable if you came up against a sharp eyed traffic copper...do we still have traffic coppers?... but worse than that you can bet your last quid that in the event of an accident, especially one where your car going out of control featured, that the eagle eyed insurance assessor would spot it with possibly expensive results for you.
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