looking for replacement Truth casement operator - installed on Marvin Integrity windows

A contractor from Cumberland, RI says:
looking for replacement Truth casement operator - installed on Marvin Integrity windows Original model #45251. Purchased new 39-318 and 39-317 as replacements and they were too short and didn't close the window. Is there another model that we could use.
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Emily from SWISCO responded:

Hi there!

We've seen this operator a few times in the past but I'm afraid we don't have an exact match. I'd say a better option would be our 39-171 and 39-172 . The offset is a bit more dramatic but it may not be a big deal. It is our best option, however. Look these two parts over and see what you think. 

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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