went with my daughter 2 months back to a ford dealer in herts as she wanted a 2yr old fiesta, had same thing of mismatched tyres even odd sizes, when you talk cash to them it makes no difference as all they ever want is finance or bank transfer, insisted to them if they sorted tyres we would buy it so salesman simply robbed wheels off another fiesta which wasa touck as they were 17s and the car she wanted only had 16s lol