Can you tell me what part I need

The part you're showing me here is called a top sash guide. We carry a ton of different kinds, all of which you can see here. In order to narrow it down further, I'll need you to remove an undamaged version of your part and show me a clear picture of it by itself and without obstruction. Let me know if that will be possible. I'd especially like to see it from the front and side. Think of it like a mug shot.