Window crank..

A quick learner says:
Hello..

Please verify if this window crank is a 39-188 ? the Arm measures 5" and the mounting spread is 5" but looks like the inner part is more like 3" ?
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Casey from SWISCO responded:

Hello,

It looks like you received the 39-089 but your original operator is a closer match to our 39-187 . The main difference between the tightness of the zig-zag in the base arm. Take a look and let us know if you have any other questions. Thank you!

Connecting a casement window operator to stud bracket
Connecting a casement window operator to stud bracket
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Anatomy of a casement window
Anatomy of a casement window
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