Del Mar Hardware window Wright split arm operator

A home owner from NH says:
Wright split arm operator like 39-387/388 but screw hole pattern different and dimensions 4 1/2 x 3 1/2 rather than 4 3/4 x 3 1/8. Also, what handles go with this?
User submitted a photo of a window operator.
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Tom from SWISCO responded:
See our 39-317 and 39-318 instead. These may be closer to what you need. I wouldn't worry about the hole pattern, yours seems close enough to ours.
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