Crank Window replacement part

A quick learner says:
I hope you have the stud bracket (not sure if this is the name). It is for item no# 39-187 The flat plate it has 2 holes on the left & right. The original is missing.
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Bob from SWISCO responded:

We don't have an exact match for this bracket, but I'm wondering if you could just use the 39-548 and 39-549 . These are flat like yours. See if they could work. 

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