Help identifying balances

A handy person from Bowling Green Kentucky says:
May 24, 2021
I need to replace balances on some 35 year old gapco windows. The only picture I have is attached. From another window, I was able to locate a stamping on the balance from another window that said 23 C.
Can you help?
Thumbnail of the uploaded file named IMG_2536.jpg
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Bob from SWISCO responded:
May 27, 2021

Gapco windows often use our Series 351 Channel Balances--but I'd absolutely remove an undamaged balance and compare its specifications to see if this matches what you need. If so, you'd likely need an S351-24, with a stamp option of 2330. 
24" Series 351 Channel Balance
24" Series 351 Channel Balance
S351-24
$10.77
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