balance numbers and part screwed on top of window

Hello, thank you for writing in! We would be happy to help you find replacement channel balances. The stamp that you indicate tells us the necessary spring strength, but we will still need to determine what series you have. In order to do this we will need to see clear images of the plastic fittings at either end of the channel. I would preferably like to see them from above with the open side of the channel, where the spring is revealed, facing up. 

In regards to your top sash guide, see the list I've created on the side. The best replacement will ultimately come down to the precise dimensions of your original part.

Great, thanks for those follow up photos. It looks like you could have either our Series 351 or Series 390. The difference between the Series 351 and Series 390 lies in the depth of the shoe. Take a look at the picture below for more detail. Once you have determined this dimension you should be able to select the appropriate balance.

Comparison of the S351 and S390 balance shoes.

In regards to your sash guide, I think the 18-199 looks like a good candidate.

Ah, thank you for letting me know. In this case, you have the 15-003 shoe. This does not come with any of our stock options, but we can have it custom made for you. If you would like to proceed, please let me know your desired quantity for each stamp option. Then I will be able to send you a custom order link!

Great! I just e-mailed you links for the custom balances you requested. You can add these to your cart, along with the rest of your desired items, on our website. Let me know if there's anything else I can help you with!