wiring a head unit

havent had a proper dig around in my cabby yet, but as far as I can see there doesnt seem to be any wiring for a headunit. Does anyone know of anywhere I can get the wiring diagram from? Im not bothered so much bout the speaker side as I'm gonna amp them seperatly. but would be better if I had power to the head first

See this for your starter for ten;

http://www.installdr.com/Harnesses/VW-Wiring.pdf