...and be safe? Probably a 205/75R15. Hardly anybody makes a 195/75R15 anymore, though they are available for the antique/resto crowd.
An old VW Beetle tire, 165R15 might fit but not much safety in that little of a tire.
205/70R15 looks perfect depending on which tire manufacturer you go with. I just recently got rid of 3.5" skinnies and 165r15 tires and changed to 15x6" and like it a lot better.
