Window balance

A quick learner says:
27HP38-40 D8A CMC 6
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Tom from SWISCO responded:

We may be able to replace this balance, but I think you might have a special type. Can you confirm the depth of the bottom shoe? That would be the "heel to toe" measurement. If you look at our 15-004 as an example, you'll see the measurement in question is 1-3/32". Can you also tell me how many you need?

A quick learner says:
It is 1-3/32". I have included a picture showing the measurement. Depending on the price I?ll probably need 4 to replace them on both windows.
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Paul from SWISCO responded:

Thank you! Upon review of your photos, I actually think you can use our S385-28 channel balance as a replacement. Like Tom said, yours is a special type, but I don't see anything in your photos that would prevent the S385-28 from working. It's a slightly different style but it functions the same way, and you can order it normally. I would recommend our 2770 stamp for sashes weighing 36 through 39 pounds. You may want to weigh your sash to confirm this is right.

A contractor from Hobe Sound Florida says:
Hello
I measured 29" x 1/2" the mark is 28-2
I need 4 of these balances.
Armand
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