Casement window operators

A quick learner from San Antonio, Texas says:
I measured the single arm from screw hole to tip at 8 and 3/4 inches, exterior measures 5 and 1/4 inches, exterior holes are 4 and 3/4 and interior holes are 3 and 7/8 inches. I thought maybe your part # 39-001 might work. Thank you for your help.
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Bob from SWISCO responded:

Thanks for writing in. I agree that the 39-001 looks promising. If the slight difference in the straight arm length proves troublesome, you could remount the track the casement operator interacts with; but honestly I am unsure if that will even be necessary, since it is very close. 

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