Emergency Brake Cable ?????????????????

I'm in the process of gathering parts to convert my rear brakes over to 10x2.5when I change out my sbp axles to Yukon's with lbp. What emergency brake cables should I use??? My car currently only has one cable on it or I would try and use the originals. I checked O'Reilly's website and they show different part numbers for the various years. 68 Dart, 72 dart, 75 dart and 69 road runner. Any help is appreciated. Thanks