Find a set of 18 takeoff for a gt or 17 for a v6. Swapping to winters is best insurance for you and your car. Cost me 600 all said n done, my deductible is 500... But can't put a price on safety.
Only better thing u can do is not drive the mustang. Get a beater winter car for a grand or two. Some will say drive careful with the all seasons, did that for a year but I can't guarantee the idiot in front of me won't stop short. I believe it was worth the investment.
But the pzeros weren't the worst AS I've owned either. If your asking this question it proves to me you've already decided on safety over a minor investment.
You know that warm and fuzzy feeling? That means something bad is about to happen...