spiral balance installation screw nut

A home owner from Indianapolis says:
Please help me to identify a replacement part for the plastic square nut in the photo. It measure roughly 3/8" square and is the nut for 5/8" spiral balance installation screw. Looks like it's simply press-fit into the channel. Thank you!
A customer submitted photo of a plastic screw nut.
Profile picture of Mike
Mike from SWISCO responded:
Good Morning,
Please see SWISCO product code 26-200, Balance Screw Plug.
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