Looking for part / GA window

A home owner from Las Cruces, NM says:
I am looking for this part that stops the Channel Block & Tackle Window Balance in a GA made window.
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Emily from SWISCO responded:

Hello there!

The General Aluminum window top sash guide shown here was discontinued and is no longer available, unfortunately. The manufacturer replaced it with the 18-066 which can work on either side of the window. Take a look and see what you think. 

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