Bill,
I've looked for years for the originals. New ones are made in Taiwan. The plastic mold is correct on them but the metal portion seems soft.
The primary issue with the originals is that the ground side of the circuit is made through the tail light where the socket snaps in. If there is a bit of corrosion or they come loose from the tail light housing, you have no lights.
The last couple of tail light harnesses I have redone, I have soldered in a ground wire circuit and attached it to the body. With this, there is always a ground circuit.
Loren