Window Balance Help
Here are the measurements of balances:
2nd flr - 6th flr: Top Sash: 29 11/16 x 27 11/16 Bottom Sash: 30 9/16 x 27 11/16
7th flr: Top Sash: 29 11/16 x 31 11/16 Bottom Sash: 30 9/16 x 31 11/16 Bottom
Balance is stamped: 30D Not sure which ones to order on your site.
Thank you for your patience while we looked into this. We may be able to help with this balance, but a big issue is that top hook in your last photo. We have looked everywhere and simply could not find anything that comes close. The only explanation is that it was custom build by the window manufacturer, since the balance manufacturer doesn't recognize it, either. If you want an exact match, you'd have to contact them directly.
The other option is to take a gamble with our balance. We can custom make this with a 15-198 hook. My hope is that this hook will work the same way as your original, but there's no guarantee.
If you were interested, let me know how many of each balance you need for your windows and we can email you an order link and price quote for the desired quantity.