Non-tilting window

A home owner from Florida says:
I am trying to identify the small plastic bushing that keeps the spacing uniform in the channel. There are four in total. All of them are in the corners of the inside portion of the removable window pane. Many of my windows are broken and/or missing. Please help.
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Tom from SWISCO responded:

Hello! This part is called a face guide. Yours in particular appears to match our 67-026. I think this is just what you need, but look it over and let me know if you had any questions!

Dimensions for 67-026
Dimensions for 67-026
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