which rotors to use

I have 11 inch granada rotors on stock 78 mustang 2 spindles, and would like to narrow it up about 1 half inch each side. Does anyone know a different rotor that would fit on that spindle, or any idea that would narrow the width. Would appreciate any suggestions. Thanks

How about new rims with 1" more set

Dont quote me on this, but i believe that grand marquis/crown vic rotors will fit on those spindles. Viking is probably right though. Go for the new rims.