Hardware assistance

A quick learner from Albany says:
June 5, 2017
I've been lucky finding the right items for my windows. The channel balances are perfect, and the top sash guides I just ordered look right also. I need another critical part which I've not been able to find.
There are photos attached of this little part that fits to the end of a horizontal channel on the back of the top of the window that presses out to the frame. On both sides it serves as a cushion between the spring loaded channel and the window frame.
Hardware assistance
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Paul from SWISCO responded:
June 8, 2017
I believe that top sash guide could be our 18-033. See if that's a match. As for the small interlock guide with two prongs, I'm afraid it has been discontinued for a long time now and there are no known substitutes. I am sorry we cannot offer something.
A quick learner from Albany, NY says:
June 8, 2017
Thanks for your response Paul. I'll find out tomorrow if the 18-033 are right when my current order arrives. So as far as the small interlock guide is concerned, would you say that it was of the same material as the sash guide? Perhaps I can fashion something to fit in that space.
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Paul from SWISCO responded:
June 12, 2017
They could both be made of nylon, but I really don't know if fashioning a plug like you describe is possible.
Top Sash Guide
Top Sash Guide
18-033
$1.70
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