need part

A professional from nh says:
I need the black part that fits into the metal guide and the black part has two round parts on it that the arms fit onto. See the 3 pictures and you should be able to zoom in to see the window sticker. This are older silverline windows
One of the number on the sticker is 10120854 6 1 2 1 1
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Dave Sr. from SWISCO responded:


Take a look and compare the 39-340 sash bracket to your part. Review the specifications shown on our product page, along with the 39-424 , to confirm which one matches up to your bracket. Thanks for posting! 

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