PanAm window balances

A handy person from Florida says:
November 4, 2016
I have windows with these spring balances. 5 windows have 1820 and 4 windows have 2340 stamped on the balance. Also, I want to replace the plastic part on the window sash that holds the balance down.
Thanks
User submitted photos of a window balance.
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Tom from SWISCO responded:
November 8, 2016
Please see our Series 377 channel balance, this appears to match what you have. For the top sash guide, check out our 18-042.
Top Sash Guide Pair, Pan Am
Top Sash Guide Pair, Pan Am
18-042
$1.97
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