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. 

39-529 : Truth Hardware Track Slider
Truth Hardware Track Slider
39-529
$0.97
VIEW >
39-253LB : Encore Dual Arm Operator, Sill Mount
Encore Dual Arm Operator, Sill Mount
39-253LB
$29.70
VIEW >
39-253RB : Encore Dual Arm Operator, Sill Mount
Encore Dual Arm Operator, Sill Mount
39-253RB
$29.70
VIEW >
39-438B : Encore Dual Arm Operator, Sill Mount, Low Profile
Encore Dual Arm Operator, Sill Mount, Low Profile
39-438B
$32.88
VIEW >
39-439B : Encore Dual Arm Operator, Sill Mount, Low Profile
Encore Dual Arm Operator, Sill Mount, Low Profile
39-439B
$32.88
VIEW >
How to Orient a Dual-Arm Operator
How to Orient a Dual-Arm Operator
VIDEO
WATCH >
Comparing the 39-253LB & 39-438B Operators
Comparing the 39-253LB & 39-438B Operators
VIDEO
WATCH >
Anatomy of a casement window
Anatomy of a casement window
VIDEO
WATCH >
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