Replacement plastic piece from window

A home owner from Minneapolis says:
October 24, 2017
I ordered some Channel Balances from your company and when replacing them I realized there was a plastic piece on the window that had also broken. I've attached two pictures - one of the side where the plastic piece is missing and one of the side where the plastic piece is in place. I need to find a replacement but not sure where to start as I do not know what this piece is called. Any help would be greatly appreciated.
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
October 27, 2017
It's hard to tell which sash guide you need by the sent images, but start by comparing it to the 18-073 top sash guide, and check out the guides on the right side of the page.
21" Series 350 Channel Balance
21" Series 350 Channel Balance
S350-21
$9.59
25" Series 350 Channel Balance
25" Series 350 Channel Balance
S350-25
$10.77
27" Series 350 Channel Balance
27" Series 350 Channel Balance
S350-27
$10.77
Top Sash Guide, Fiberlux
Top Sash Guide, Fiberlux
18-073
$1.32
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