i just replaced the rear taillights on my stepside. it took me a few years, but i finally found a stepside in a junkyard, and i removed the original taillight housings from it. since they were badly rusted, i coated them with POR15, which is shiny black. i was also worried about the taillights being dim, and so i put a lining of aluminum foil on the inside. the foil was nice because it conformed to all of the oddly-shaped surfaces of the taillight housings. plus, it was cheap and readily available. i don't know if the lights are any brighter --- i'll have to check tonight when its dark.
jewels.
These are the old taillights:
and these are the new taillights:
hmmm. looks like i need a wax job --- the red is turning a bit orange in that second pic.