The green jeweled lens is used as the flasher warning lights in your dash and flash anytime the hazards or blinkers are in use. It is also used in your Mk2 and Mk3 driver's door panel to illuminate your key hole in the dark. Not used in the Mk1. Mk1 people have a good sized map light in their review mirror to find their key hole! We Mk1 people need all the help we can get! This item is NOT OEM/NOS. The lens is now flat.