9-1/8" Single Arm Operator w/ Square attachment

A home owner from USA says:
I am looking to replace this single arm operator with square attachment.

Length of the arm is 9-1/8"
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Casey from SWISCO responded:

Hello,

Unfortunately, this old Andersen operator has been discontinued and is no longer available. We don't carry a direct replacement but you could consider our 39-365 and 39-366 operators as a possibility. You would also need a new track to go with it. I'd recommend something like our 39-504 or 39-512 . I can't be certain this will work, and it will take some adaptation no matter what, but look over the parts we've mentioned and see what you think. 

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