Looking for the window lock

Hello,

I can't be sure based on a damaged balance but you may need the S500-21 and S500-30 balances for non-tilt windows. Take a look and confirm the style of the spiral tip matches an intact balance from one of your windows.

How to measure the length of the Series 500 spiral balance.

Unfortunately, I don't recognize the parts shown in your last two photos as first glance. If you could show us what they look like installed and elaborate of their function, we can go from there. Thank you!