Which cable fits to K-Line pin out?

Hello,

I want to reset the factory HU Skoda Symphony. The electrician who put my aftermarket radio at the past, removed the k-wire from the pinout 3 from the connector III as seen at http://www.packetradio.co.uk/Cars/octavia/radio.htm

Now, after the reset of my old HU I do not know which cable of the bundle I have to put the pin 3.

(The HU is completely functional now, but I want to