Plastic corner part to window frame that holds top Balance

A quick learner from San DIego says:
July 21, 2020
I need to the black corner part that fastens to the corner of the window frame that hold top plastic part of the Balance.
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Casey from SWISCO responded:
July 23, 2020

Hello,

We have recommended our 18-172 to a customer with a similar top sash guide in the past. Take a look and see how the dimensions compare to yours. The one thing that I can't account for is the offset of the screw hole in your guide. If the dimensions match up, you may still need to drill a new hole in the 18-172 to install it. 
5/8" Top Sash Guide, Harcar
5/8" Top Sash Guide, Harcar
18-172
$1.55
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