I'm asking because if a company is selling a specific left and a specific right, they must know that they will be used for running lights and for stop/turn. Having the left light with two one filament bulbs makes sense. That way they have a license light/tail light on bottom.....and a stop/turn on top.
For the right, which you say you have, and I thought was missing something, may be actually set up for one dual filament bulb. That would work.
1. Wait for the left to be delivered.
2. Does the right have a hole in bottom?
3. Didn't you get instructions or a picture to tell you what the hanging copper strip does?
4. Did you put that bulb in?
5. Is there some info you haven't shared?
6. What is the part number and vendor of the one you have? and......what is the part number and vendor of the one you are waiting for?
Jim Carter or Classic trucks do not seem to sell them as left/right.