Just a reflector, the older trucks had a light there, you could wire up a light if you wanted the added safety, but a reflector is all you really need.
If you look through the lens you can see a large X shape that is the opening that a bulb holder would twist and lock into place.
My 2002 screw has em-so 01 wasnt the last year for em!
Could be a build location item ???
Blue Island had a 2002, if memory serves me correctly.
Then again, my memory usually gives me a dirty dish with a cigarette butt in the mashed potato, instead of the meatloaf special that I ordered.
Edit:
FF find feature works wonders. Seached and some members with 2003 had them, as well as some 2002 owners, so I am now down to guess it is a build location thing. Forget where my '01 was built, Flint ???
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