Replacement channel balance 28D 29 inches

A home owner from Orlando, FL says:
January 27, 2021
Metal shafts are 29 inches and stamped 28D. The window is larger than standard single-pane window.
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Bob from SWISCO responded:
January 27, 2021

I want you to look at our S380-29 Channel Balance. Review all the specifications and see if you think this matches up. For a new stamp option, choose 2840. 
29" Series 380 Channel Balance
29" Series 380 Channel Balance
S380-29
$11.10
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