single hung window balance spring & Top Sash Channel Balance Guides

Hey, thanks for posting, Omer. I've narrowed this down to two possible channel balance Series: either our Series 380 or our Series 385 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 380 uses the 15-005 while the Series 385 uses the 15-004. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match.

For the top sash guide, see our 18-171. We don't have an option that corresponds to a 28 9 stamp, so you will have to weigh your window sash in order to determine which is best.

Thank you so much! Glad to hear everything worked out for you.