265's will absolutely not fit in the rear (will rub the fender). The widest I've seen is 255's in the rear with optimal offset and the rear fenders trimmed to the max. I doubt the fronts will fit either (too tall). Depending on offset (which I don't think was specified on the auction), you will probably want to run 225/40/18 in front and 245/35/18 in rear. You may be able to squeeze 255/35's on the back if it's the right offset. HTH.