3630 imprint channel balances

Thanks for posting. The stamp code on the metal channel only tell us the strength of the spring calibrated inside the balance. To know type or Series of balance you need, we need you to remove the balance from the window and show us pictures of the nylon fittings on either end. 

That said, if this is a non-tilt window, it seems to me that the real issue here is that your channel balances shot past the window sash because the nylon guides on the corners of the sash meant to hold them in place, the top sash guides, have broken. These are called Top Sash Guides. So basically, it's possible your balances are fine and you just need to replace the Top Sash Guides. If there is an undamaged version you can show us out of the window and from the front and side--mugshot pictures, basically--we will do our best to identify it for you. Many thanks. 

I'm afraid not. We need to clearly see the Top Sash Guide out of the window, with pictures of the front and side. For information on how to remove your guide, see the video below.