Thanks for writing in! I am confident that we can provide you with a replacement balance, however, to be absolutely sure, I'll need to see a photo of an undamaged balance removed from the window. I am not able to identify your balances using the stamp information provided from the window.
I'll also need to know the stamp from the metal channel of the balance, which will only tell us the weight range your balances should be able to support. It will not help to identify the type of balance you'd need, unfortunately.
I am specifically looking to see any attachments that could be connected to the balance or that may still be in the window channel, connected to the bottom of the sash.
Let me know if you have any questions.