Please assist with part identity

A home owner from Denver says:
May 1, 2015
This plastic piece normally inserts on the top/side port of a 2-pane slider, non-tilt window, and holds the top part of a channel-balance spring system. I need to find a replacement part for a broken plastic piece (not shown)

Thanks
A home owner from Denver says:
May 1, 2015
Oops-forgot to attach pics
User submitted photos of a top sash guide.
Profile picture of Paul
Paul from SWISCO responded:
May 4, 2015
See our 18-073 top sash guide and let me know if that's a match.
Top Sash Guide, Fiberlux
Top Sash Guide, Fiberlux
18-073
$1.32
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