Sorry Leon id forgotten all about this here you go.

   Using this Led from jaycar http://jaycar.com.au/productView.asp?ID=ZD0140&CATID=33&form=CAT&SUBCATID=428

And the resistor shown on the diagram the hardest part is mounting the leds into the car a small amount of solder and some heat shrink and your done you could even add tail lights to the rear of the car simply by making a second circuil like the front 

 Hope this helps

Dont laugh at my diagram im sadling lacking in the wotto skills