39-089 with 4" arm

Thanks for posting. Can you remove the operator in question from the window and take a few pictures of it for us to see? There are a few more subtle differences in this style of operator from model to model and the easiest way for us to determine what you have is to just see it. Thank you!

Thanks for providing this image! This gives us a much better idea of what you have. Now, we have checked our sources in the past for an operator with a 4-1/2" arm, but we have had no success. You may want to check with the manufacturer who supplied the windows, as it's possible that they can help you.

The fastest solution, however, may be to simply swap the link arm from your old operator to the new one. Check out our 62-014, which you can use to re-rivet the arm.