There were 2 different cord configurations for the 301. 2 cords (one for the pedal and one for the plug) for the ones in cabinets, and one cord (pedal and plug on the same cord, like the FW, etc) for the portables.
That said, I've been told that the double lead cord (single cord, 2 ends) works on the machines configured for the 2 separate cords. Obviously the other way around wouldn't work, you'd have no pedal.
