39-387 & 39-388 too short

A quick learner from united states says:
I ordered parts to repair a 7500 series window, which I received.
However, the operator arms are not the appropriate size to accommodate the window. I have attached photos in an effort to determine what the correct part is to resolve the issue.
The parts received: 39-387 & 39-388 are too short and not the correct replacement.

Thank you for your time & effort.

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Tom from SWISCO responded:

Hello, John. Your operator is actually discontinued and no longer made, but the video below will explain to you exactly which products can be used to replace them, and how.

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