Milgrad 48x56 window. Sticker says LGWM2101HW

A home owner from San Marcos, CA says:
November 21, 2016
this plastic part is at the top of the window where the balancer should catch on. The broken one has the top of the piece broken off and the balancer stays up. What is it called?
User submitted a photo of a top sash guide.
Profile picture of Paul
Paul from SWISCO responded:
November 23, 2016
I would start with our 18-188 top sash guide. This may be what you want, but you would need to make sure the dimensions all match up.
5/8" Top Sash Guide
5/8" Top Sash Guide
18-188
$1.44
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