what rotors fit?

Yes, i'm familiar with that magazine article.
It DOESN'T say a darn thing about 11 3/4 rotors on a A body automobile. It states the 11 3/4 inch rotor STARTED in 1976 on the Cordoba, Magnum, line of cars.
Being a police, or fleet, car has got nothing to do with it either. There NEVER, EVER, was an A body that left any of the factory assembly lines with 15 inch wheels and tires.
Believe what you wan't to believe, but you will be wrong in your thinking.
It's very easy to change the caliper mount, and then install the 11 3/4 inch rotor, and then 15 inch wheels, and that's what probably was done somewhere in the life of the car that you are talking about.
But Mother Mopar didn't do it.