Side turn signal marker
 

My 1987 Cab doesn't have the side turn signal marker / side lights on the front fenders. Should I have this light? Worth installing?

Those were on ROW (Rest Of World) cars, not US market cars. US cars did not ever have these.

An easy way to tell, on some models, that the car may not meet or may not have met when built, DOT standards. Some earlier ROW cars did not have them.

I believe the side markets started in 1980 on the RoW cars.