The one closest the screen (for the upper window)
Vertical sliding windows.
The part I want is the top with the two screws, the "band/spring/roller"? and the bottom part. Or full assembly
Tom from SWISCO responded:
April 27, 2017
Sure thing, see our 15-180 pivot shoe, 15-181 detent clip, and Series 190 spring. You'll need the number on the old spring to confirm what Series 190 option will be best.