Unique 28-C-30 Window Balance

A handy person from Orlando says:
I have a single hung single pane window and need 2 springs.
Number on the balence is
Unique 28-C-30.
Don't know the weight
But the size is 52 wide by 31 high for the one panel.
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Emily from SWISCO responded:

Hi there!

With this combination of attachments, you could have either an S380-29 or S385-29 channel balance. You’ll need to measure as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. You'll also want to select the 2830 stamp option when prompted. This is based on your older stamp rating of "28C."

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