you need to find out how wide those stock rims are to make sure how wide of a tire will fit. TireRack.com has a table that will give you such info. I do suggest to get like a 40 or 45 series tire. The series of tire is the % ratio of how wide your tire is in relation to how tall the side wall is. The side wall on a 225/50/16 is much smaller than 255/50/16. 255/50/16 tires would look like truck tires on a stang. 255/40/16 tires would probably be a better size. It will be wider than the stock tires but the same height if not just a hair shorter.