plastic part/plate needed that stops channel balance from wanting to pop out .

A home owner from Milton says:
Just purchased several sets of this product: S371-28 : 28" Series 371 Channel Balance, but the window is missing the plastic part/plate that stops this channel balance from wanting to pop out, can you help me locate a replacement piece. Picture shows existing part in place and the other side of window that is missing one. Thank you
User submitted photos of window hardware.
Profile picture of Casey
Casey from SWISCO responded:
Judging by your photos, I think our 18-118 top sash guide would be a great option as a replacement for you.
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