Pan Am window parts?

A home owner from Gainesville, FL says:
July 29, 2019
I believe these are Pan Am window parts. The #s on them are 1820 and 2320. Please verify.

Thanks!

Russ
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Casey from SWISCO responded:
August 1, 2019

Hi Russ,

Take a look at our S377-19 and S377-24 channel balances to get started. I'd recommend reviewing the images on our product page to make sure that your end attachments match the pictures on our website exactly. If so, you'll use the stamp number on your balance to choose the corresponding spring strength option. Thank you!
19" Series 377 Channel Balance
19" Series 377 Channel Balance
S377-19
$9.34
24" Series 377 Channel Balance
24" Series 377 Channel Balance
S377-24
$10.77
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