WE CAN'T FIND ANY MARKINGS, we need to fix two windows so far

A from Portland Tennessee says:
I had to create an access hole at the top behind the window stop to gain access to part..per your self help video..
looking at what you have on inventory would the part with product code 15-045
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Bob from SWISCO responded:

Thanks for writing in. If the thickness of the shoe is 3/8" but the width is 15/16", I think the 15-212 might actually be the better option. Carefully double-check the dimensions and see if you agree.

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