On ebay I saw some correct looking reproductions titled "Willys MB Ford GPW Jeep Truck Military Cat Eye Rear Tail Light 4" Pair". I bought a pair for about $55 including shipping. These look pretty good, and have the advantage of having replaceable (and readily available) 12 volt bulbs. The connections on the back are threaded studs, so might lose you points if your truck is judged for historical accuracy. The two mounting studs are about 1/4" closer together than original and would require drilling some new holes in the mounting bracket.
Overall I'm pretty pleased with them. The slight inaccuracies don't matter to me as I drive my truck for fun, casual display and parades. I like to think its dents and faults give it character.

