Plastic piece found at top of window

Hello,

We'd be happy to help but to get started, we'll need to see an undamaged version of the top sash guide in your photo removed from the window, along with dimensions to compare to our selection. 

We'll also need to see one fo your balances removed from the window, including both top and bottom attachments, along with the stamp number on the balance to narrow down your replacement options. Thank you!