Piece that pushes balance down

A quick learner from Daisytown says:
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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Thumbnail of the uploaded file named 442DC49C-69D0-42A5-9C7B-60137B998884.jpeg
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Donna from SWISCO responded:

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!

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