casement window operator, left-handed

A home owner from Chapel Hill, NC says:
August 12, 2016
I've a worn-out "R.O.W." left-handed operator, arm is 13 1/2 inches long, screw holes in crank are 4 1/2 inches apart. My window repair man could not find a replacement, so he gave the used part back to me.
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Tom from SWISCO responded:
August 15, 2016
It's hard to say what will work without seeing your hardware, but start by looking at our 39-013 and 39-014. Could these be what you need?
Casement Window Operator, 13-1/2" Arm
Casement Window Operator, 13-1/2" Arm
39-013
$20.70
Casement Window Operator, 13-1/2" Arm
Casement Window Operator, 13-1/2" Arm
39-014
$20.70
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