Help identifying correct part

A home owner from Dunedin says:
I'd like to replace the balances in a few of my windows. They have 28D stamped on them.
Thank you for your help!
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Bob from SWISCO responded:

Take a look at our S380-29 Channel Balance. Look over all the dimensions, especially the 1" depth of the bottom nylon shoe, to confirm this is the balance you need. Choose a new stamp option of 2840. 

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