Stop in for a cup of coffee

I found a set of 15x7 original police steelies that I am picking up this weekend, so next week i can work on having new tires mounted. I like the stink bug stance so i am looking for recommendations on what size tire I can put on the rear to give her a little boost in the caboose.
Bah!! i have been checking locally for a set 3-4 times a week online here.... congrats on the find :)