Hi Vanarebane,
The red and black wires are slightly longer as they have to go to the red cruise control button switch, and the shorter yellow and orange wires go to the green horn button switch.
The switches are identical so it doesn't matter which one you use for each function, and the polarity of the switches is unimportant, so the two wires can connect to either of the switch terminals.
I have attached a picture showing the inside of one of my more recent switches which should be the same as yours.
Alan