Marvin Awning window part

A home owner from Buffalo, NY says:
Attached is a little plastic clamp that holds the track in place on the left and right. Windows were purchased around 2000. We can't find these and they crack and lose their rigidity. Can you help find the part or something that would work or what the name of the part I would search for? Deanna
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Tom from SWISCO responded:

Hello,

We don't carry these clamps, unfortunately. I do see them from time to time and I believe they're from an older version of our 36-078B . I'm not sure if it's discontinued  but it's not something that we can supply at this time. We apologize for the inconvenience. 

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