I know the car version of this light had a weep hole (1/8" maybe) at the bottom of the bucket close to the lens trim ring to allow condensation or rain water to drain out. I assume the trucks would be the same...anyone with an original light care to see if they have that hole?
The parts book lists different tail lamp assemblies for tag above and tag below, which leads me to believe the weep hole location is the difference.
Mike B
