Part that has the spring to slide window

A home owner from FL says:
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:

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.

15-005 : Winged Channel Balance Shoe, 1
Winged Channel Balance Shoe, 1" Depth
15-005
$0.71
VIEW >
19-018 : Channel Balance Top, Pan Am
Channel Balance Top, Pan Am
19-018
$1.22
VIEW >
How to Replace a Channel Balance Attachment
How to Replace a Channel Balance Attachment
VIDEO
WATCH >
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