The conversion harness' male connector attaches to the female JST connector of an existing 5-Pin Wiring Harness, which is commonly used for attaching to a Sanwa or Seimitsu joystick lever.
 
Each color signal wire represents a joystick direction, and single black ground wire works as a daisy chain.  Each wire contains a .110" female connector, which installs into most common Japanese pushbuttons.
The harness also allows conversion to All-Button without extensive rewiring - simply remove the harness and you can again utilize the standard joystick lever harness. 
 
If you have considered moving to a stick-less design, and enjoy designing your own case and internals, you'll find this harness is a great choice to use with commonly available wiring.  
 
There are 3 typical senarios that you need to buy this wire 
1. swap sanwa jlf stick or sanwa typed 5pin stickser to crown 303.307.309 
2. swap sanwa jlf to jlw stick 
3. converter you fighting sticks to hitbox or mix box style stick