This reverse gearbox cable for go-karts with torque converters uses a barrel on both of the wire ends. This gearbox cable is made especially for those go-karts that use the torque converter system. These typically have gasoline engines in the 6.5 horsepower or similar range.
Unfortunately we don't have a resource for that, but you should be able to find that information or a video showing how to perform those adjustments by doing an internet search for "reverse gearbox cable"