Chaging channels in the windows

A home owner from Brandon, FL says:
I bought the new channels from you according to the directions per you tube video and measurements. The channels fit great. The top if the windows have a plastic piece that is broken on one side. The right side is not catching on the channel.
I am hoping you can figure out what the name of this piece is and I will buy 4.
Hope you can help.
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Julia from SWISCO responded:

Hi there! Thank you for writing in. It looks like you are in need of a top sash guide. Take a look at the parts I've linked on the side. Compare their dimensions to your original hardware to see if any of them might be a match. 

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