Up and down window cannot hold when lifted

A home owner from Florida says:
May 26, 2017
Hi,
I have several windows cannot hold when lifted, it slides down immediately.
I found a plastic part at the top corner is broken, the one I showed in the picture is a good one.
Can you help me find the piece?

Thanks,
Kevin
top sash guide
Profile picture of Tom
Tom from SWISCO responded:
June 1, 2017
Hello Kevin. I believe we may be able to help you. Please take a look at our 18-166 top sash guide. Carefully compare your measurements to ours and let us know if this is a good match for you.
5/8" Top Sash Guide, Kinco
5/8" Top Sash Guide, Kinco
18-166
$1.33
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