Broken plastic part

A home owner from Grand Rapids says:
My window would not stay up. Disassembled balance and noticed a broken plastic part at the top. The guide is 36" tall, 9/16" wide. Only marking I could find was on the guide metal "36G EC5 CMC"
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Tom from SWISCO responded:

We don't have a plastic screw-way exactly like this, but our 19-036 is very similar and serves the same function on this kind of balance. Look this over and see if it would be a good fit.

Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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