Missing piece I cannot find

A handy person from Wheeling says:
We are looking this part, but left hand
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Tom from SWISCO responded:

Thanks for reaching out to us. Before I recommend anything, can you remove the operator you still have and show me a picture of it by itself? Many important details are obscured while it's still installed. 

A handy person from Wheeling says:
we can not do it right now because its from customer house, can you advice at least something similar?
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Tom from SWISCO responded:

Our 39-142 and 39-139 are two possibilities, but you'll have to compare them to the original to know for sure.

For future reference, it's always important to remove the operator from a window when trying to ID it. Too many important details are obscured as long as it's still installed. This could save you a trip next time.

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