Please advise me of the correct part number Thank You

A handy person from Florida says:
Part is 1" wide
2" High
9/16 Deep (outside frame only without rotating piece)
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Paul from SWISCO responded:

Hello, thank you for posting,

Unfortunately the company that made your balance system, Unique Balance Company went out of business. We believe the 15-179 pivot shoe, 15/16" wide by 9/16" thick should work as a replacement for your window. Please review to see what you think! 

Alternate image for 15-179
Alternate image for 15-179

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