Piece that pushes balance down

A quick learner from Daisytown says:
October 16, 2019
I bought four 16" Series 351 Channel Balances. I didn't realize I also needed four of the part in the pictures. This piece attached to the top of the sides of the window and fit in the channel.
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Casey from SWISCO responded:
October 16, 2019

Hello,

I'd recommend by starting by carefully comparing your top sash guide to our 18-110 and if there are any discrepancies, let us know how and if they differ. Thank you!
Top Sash Guide, SeasonAll
Top Sash Guide, SeasonAll
18-110
$1.70
Yale Ogron Vent Bracket
Yale Ogron Vent Bracket
18-168
$1.57
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How to Replace a Top Sash Guide [1080p]
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