non-tilt window channel balance repair

A home owner from Arlington Heights IL says:
October 28, 2016
Dear Sir, The photos I've sent are from an identical setup on a working window. I broke the ivory colored plastic piece. These windows are probably 50 years old. I could find no markings on them. I'm looking for some assistance in locating the part or other solutions.
Jerome Alt
User submitted photos of window hardware.
Profile picture of Tom
Tom from SWISCO responded:
November 1, 2016
I'm not sure if we have this exact piece, as your balance system is very old. That said, see our 15-104, this might be something you could use. Let me know what you think.
Caradco Friction Shoe
Caradco Friction Shoe
15-104
$1.95
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