This dual LED is designed specifically for the pin connector of the Ultimate 64 and Elite. 

Simply plug the three wire connector into the LED pin header on the Ultimate 64 mainboard.  There is no wrong way to plug the cable in.  Plugging it in in one orientation or the other will determine which color applies to the power light and which applies to the drive activity light.

Note: Wire colors will vary.

Overall length is no shorter than 40cm (about 15.5").