Window Channel hardware

A quick learner from Spring Hill Florida says:
I am not sure what this piece is called. I am having a hard time locating a replacement. I took a picture of a window with the hardware intact and a picture of the window and the missing hardware. Can you help identify the item and do you have any in stock?
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Paul from SWISCO responded:

The nylon piece you show is a match for our 15-205. This is a cover designed to hold three 3/8" thick Series 165 coil springs, which in turn are designed to attach to either a 15-111 or 15-199 pivot shoe. Look these parts over and let me know what you think.

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