pivot shoe for twenty year old vinyl tilt windows

A home owner from Buffalo ny says:
no markings found but they seem to match up to part #15-188
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Bob from SWISCO responded:

Thanks for writing in! It is possible that this is either the 15-188 or the 15-178; but you will need to remove the pivot shoe from the window and measure the width and thickness to see which matches best. Let us know what you find.

How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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How to Remove a Pivot Shoe (Cutout Method)
How to Remove a Pivot Shoe (Cutout Method)
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How to remove window pivot shoes
How to remove window pivot shoes
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Anatomy of a tilt window
Anatomy of a tilt window
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