Help identifying replacement channel balances

A home owner from SW Florida says:
Need help identifying replacement channel balances. See pictures. Current one is marked UB 28D. Metal part of balance is 29" long (not including plastic ends). Non-tilt window. 1/2" width. Window is large at 50" wide by 31" high.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. Please see our S380-29 channel balance. I believe this can work for you as a replacement. I'd also recommend our 2840 stamp option for sashes that weigh 23 through 28 pounds. You may want to weigh your sash to confirm that this is correct.
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
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How to Replace a Non-Tilt Channel Balance
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