Replacement for Silverline Casement Window operator, marked Roto OP05-7524-03

A professional from Ann Arbor, MI says:
Replacement for Silverline Casement Window operator, marked Roto OP05-7524-03, made 2003
Arm is just over 9" long
Crank handle has allen wrench-type spindle, although I would take it either way
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Tom from SWISCO responded:

This looks a lot like our 39-399, but your arm is a lot shorter than ours. Please bear with us a little longer as we try to find a smaller version of this operator. Thanks again for waiting! Please see our 39-429, I believe this can work for you.

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