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[Guido]

First off, try buying 14" rims for your car... I doubt you'll find any and your problem will be solved.
Then with the money you would have spent on rims, get good snow tires and mount them on your existing rims. Then you have all winter to find a set of rims for your all-season tires.

If your friend doesn't want those tires at all, take them, sell them, and put that money towards tires for your car.