That 'get out' clause is more hassle than it is worth. How does the second or third owner know what their predecessor has done to the car in their care?
Unless you have a precise list of the factory options available, as a second or third generation owner, you'll not know what is fitted and what has been changed, especially if you are new to that make and model.
I wonder how many people have been caught out because a previous owner made a modification that they didn't declare upon selling the car?
I also wonder whether someone could claim ignorance in a court of law should they need to sue their insurer for failing to honour the insurance policy. Voiding a policy because the alloys aren't the original factory fit is one thing, if the current owner had changed them, but if they came with the car when it was purchased second hand by the current owner, could an insurance company justify voiding an insurance policy? I think not.