Need new window balances

Thanks for posting. These balances look like they might be our S380-29 . It comes down to the depth of that bottom nylon shoe, or the 'heel-to-toe' measurement. See the illustration below for reference. If the depth is 1", then the S380-29 should work for you, but I think it's possible you might find the shoe is only 7/8" deep. Please let us know if that's the case; you would need balances that use the 7/8" deep 15-029 shoe, which none of our stock items use but we could make for you via custom order. It is possible the balances you originally tried had too deep a shoe, hence the issues--but confirm the measurement before we decide that's the case.

Comparison of the S380 and S385 balance shoes.

As far as the stamp, if the sash weighs 13 pounds you're going to want balances stamped 2820, or what conforms with your old balance's stamp of 28B. These indicate balances that are calibrated to support window sashes in the weight range of 12 through 16 pounds. Balances calibrated for a lesser or greater weight range will simply not work correctly for the window. Let me know if you have further questions. 

Perfect, thanks for getting back to us. In that case we will have to custom make this for you. What I'll do now is email you a purchase link and price quote for 4 of these balances. You can use that link to add them to your cart, after which you may check out at your leisure.

These will be 29" long balances made with a 2820 stamp option. They'll also have a 19-005 top and 15-029 bottom nylon fitting pre-attached, so they'll be ready to install out of the box.

Please feel to reach out if you had any other questions.