3020 non-tilt window parts for my 1981 window

A home owner from west palm beach, fl says:
January 12, 2020
Non-Tilt window
only markings on the channel balance are 3020
width 1/2"
approx 31" long
home built in 1981
Also the top of the window plastic piece is broken (see pic - where window balance has pushed thru);
Thumbnail of the uploaded file named IMG_0098.jpeg
Thumbnail of the uploaded file named IMG_0096.jpeg
Thumbnail of the uploaded file named 3020 balance stamp
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Tom from SWISCO responded:
January 14, 2020

Hello! Your part looks similar to our S377-31 channel balance. This comes with a 19-018 top and 15-005 bottom nylon fitting, so as long as those match up then you should be good to go.

As for the top broken piece, it could be our 18-042. This is the top sash guide designed to go with the S377-31. I recommend removing it from the window to confirm.
Top Sash Guide Pair, Pan Am
Top Sash Guide Pair, Pan Am
18-042
$1.97
31" Series 377 Channel Balance
31" Series 377 Channel Balance
S377-31
$11.52
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