Actually if take the front lens off, you will find a reflector inside of the clear lens. Take it off and you will see. The front lens should be replaced if you take them off and they are old. I have seen the higher mileage ones that are cracked and weathered.
We carry them in the partsshop if you need them.
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM