flare nut size

I'm replacing the radiator in a 2002 grand cherokee. Anybody know the correct size for the flare nuts that attach the trans oil cooler lines to the radiator? I was going to pick up a flare nut wrench .

Without personally knowing, the best advice I could give is just to size it up with your open end wrenches or a vernier caliper.
That way you don't have to buy a set and only use just one!