I found what I think is a matching cable on DFrobots under Arduino sensor parts as a Cable for Arduino Analog Sensors. It looks like the right cable. It is 3 pins with a JST type connector. It is the best fit I can find since Solarbotics no longer ships the IR Sharp Cable with the unit. DFrobots sells the same IR sensor with the cable and that cable matches the Arduino Analog Sensor Cable and the Sharp part number as “JST -3 Sharp” for the cable.