Snyder's reference below.
They seem to be coming back slowly. I sought the drum tail light and when I looked to buy a couple of years ago the only thing available was the black (commercial) version - which happened to be what I wanted. The nickel version then was "discontinued."
And then the commercial version complete unit became "discontinued." By then I had mine.
Now, the "parts" are starting to come back. Dividers, cases, license bracket are available as "pieces" in a kind of "hit or miss" availability.
Now the complete tail light with license brackets are available in RH side only (no window for the license plate) with LH showing as "Temporarily Unavailable." The LH side case covers are available both black and nickel - go figure.
Its obvious a "gaggle of production" has been made and is unequally selling out depending on market demand.
Joe K