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A handy person from Ashland, MA says:
These two guides are on each side of the window allowing a bar to slide up and down. The church windows are over 50 years old and the plastic is getting brittle. If you don't have them, any suggestions as to where I might be able to get them.
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Casey from SWISCO responded:

Hello,

I don't recognize these window parts at first glance but I'm going to have one of our senior experts take a look and see if they have any ideas. We'll reach out as soon as more information is available. Thank you!

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Dave Sr. from SWISCO responded:

Unfortunately, I believe that the bar guide for your older aluminum awning windows is no longer available. 

With that being said, take a look at the 36-077 bar guide to see if the specifications might work as a substitute. We can't make any guarantees but this would be our best match at this time. 

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