The stock fans fit on this radiator regardless if you're running a manual or auto setup. All of these radiators have built in trans coolers, so it is compatible with auto and manual. The only additional piece you should purchase if throwing this radiator into a P11 is longer hose for the coolant overflowport, on this radiator, it points in the opposite direction of the coolant reservoir tank, about an extra 4-5 inches worth of hose does the trick, or purchase a entire new hose like most people do.