The Driver’s door sliding window has a rattle. There is a U-shaped plastic piece on the bottom of the glass that acts as a kind of runner in the slot of the window frame. This had worn out. There is also a rubber section at the top of the frame to help seal the glass, and this was missing.
Fortunately, I had a spare window, and so I could dismantle the window to combine the best parts.
This is the window, showing the plastic runner that wears out. I had a passenger side one of these, which is good because the passenger side tends not to be as worn, as it is less used. All that is required is to remove the two screws from the catch and invert it to fit the other side.