truth crank replacerment

A quick learner from new york says:
If you can tell me what part # is this so i can order it
thank you
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Emily from SWISCO responded:


This looks like it could be either the 39-253LB & 39-253RB or the 39-438B  &  39-439B operators, depending on the design of the guide at the end of the arm. Take a look at the video below that will help you choose the appropriate replacement. 

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