I do not know what you call the pieces.pins, that are spring loaded that lock into place in the holes that allow you to set the bottom of the window at different heights in the window frame, window goes up and down in the door. They are a soft metal and these ones have nipples that extend from a larger block of metal with integrated thumb ridges. The ones on my window are worn off or broken off.
My Fiber Stream
has the same vertical slider window in the same style entry door.
The "pot-metal" latch is broken in mine, also. If you don't squeeze the latches toward the center of the window sash every
time the window is raised AND lowered, those tabs break off very easily.[b] I think every one that was ever made is now broken off. Not the upper half mind you; just the lower half! My window sash fit in the frame snugly enough that they stay in position without the tab engaging into the slot.