Casement window crank arm

A quick learner from Colorado says:
40987
Looking for replacements
Thanks!
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Bob from SWISCO responded:

This looks like either our 39-253LB & 39-253RB, or the 39-438B & 39-439B. The difference between these two sets of operators is explained below. 

How to Orient a Dual-Arm Operator
How to Orient a Dual-Arm Operator
VIDEO
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Comparing the 39-253LB & 39-438B Operators
Comparing the 39-253LB & 39-438B Operators
VIDEO
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Anatomy of a casement window
Anatomy of a casement window
VIDEO
WATCH >
How to identify casement and awning operators
How to identify casement and awning operators
GUIDE
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