Hurd window operator

A home owner from Massachusetts says:
April 24, 2018
I am trying to replace what looks like a Hurd casement window operator. The photo shows a left opening window that works fine but I have 2 right side opening operators that need replacing. I am wondering if either the 39-035 or 39-317 would be the correct replacement. The outside dimensions of the cover is the same as the 39-317. The length of the arm from the hinge to the hole of the window attachment is 3 1/2".
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Dave Sr. from SWISCO responded:
April 27, 2018

Hey there. In my opinion, I honestly do not think either of those will work. The 39-317 is close, but your link arm is mounted above the gear arm. With that detail in mind, please visit both our 39-387 and 39-388 operators. I believe you will find these match more closely. 
Split-Arm Operator, Wright
Split-Arm Operator, Wright
39-387
$36.20
Split-Arm Operator, Wright
Split-Arm Operator, Wright
39-388
$36.20
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