This is the long vertical linkage that runs along the side of a window frame in a 1966-68 Airstream. It connects the glass bar arm near the top of the window to the rack window crank operator below. It is attached at both ends with E clips (not included).
We have rescued a small number of these linkages but they have been sitting in storage for decades. They are complete, straight, and structurally sound, but they are made of steel with zinc plating that is in poor condition due to shelf wear and oxidation. They may have surface rust so you may need to sand or grind off some rust and then paint them.
Overall 12-1/2" long.