39-020 vs 39-021, Right vs Left Cranks

A purchasing agent from California says:
39-020 & 39-021
Please let me know which is Right and which is Left.
Need to order 2 lefts and 1 right and don't want to mix them up.

Thanks for your quick reply.

Profile picture of Tom
Tom from SWISCO responded:
Thanks for posting. This is a good question.

The reason why we don't specify which operator is left and which is right is because the right and left hand sides vary from manufacturer to manufacturer. Some companies define the way the window opens as left or right, while others define which side the operator sits on as left or right.

The best way to tell which arm is right and which is left for your specific window--and not a generalized standard--is to look at your existing operators and match them up with our pictures of the 39-020 and 39-021 on our site.

I hope this information helps you!
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at 856-317-6263 or at help@swisco.com.