Tire Rack www.tirerack.com will sell you mix and match any size you want. Shipping is that bad either; they you'll have to find someone to mount them for you. I don't think a pair of tire irons would work real well.Hope they are not run flat tires, had on BMW and they make low resistance tires seem good. Would be better to change out factory tires for something better, even if you lose a couple of MPG's. Trouble is, it would be hard to get a good deal on three tires, especially two different sizes.