S850-26 too big for my windows

A landlord from St Thomas says:
I ordered this part from you and its too big for the windows. The smaller one is the one I need. the bigger one is the one I received. I need to return those for the right size.
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Tom from SWISCO responded:
I'm afraid your image didn't upload. Can you try again? Can you also go into more detail about the difference in size? Are you referring to the length of the balance or the size of the shoe?
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