Part that has the spring to slide window

A home owner from FL says:
May 3, 2021
I've attached pictures of one of the bar that enables the window to slide up & down. Since there are different sized windows in the house, we have found 1840, 2340, 2320 & 1820 stamped in the metal.
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Tom from SWISCO responded:
May 6, 2021

This part is called a channel balance. Yours looks similar to our Series 377, which comes with a 19-018 top and 15-005 bottom nylon fitting. As long as those match up then this should work perfectly for your windows.
Winged Channel Balance Shoe, 1" Depth
Winged Channel Balance Shoe, 1" Depth
15-005
$0.74
Channel Balance Top, Pan Am
Channel Balance Top, Pan Am
19-018
$0.92
How to Replace a Channel Balance Attachment
How to Replace a Channel Balance Attachment
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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