help replacing andersen operators

A professional from WATERVILLE, ME says:
I have Anderson casements here at the hotel, 1964 vintage. The casement operators are stamped 7073B on the left openers, don't have a right handy to see what's there, but I need rights and lefts. Are replacements with 11.25" arms available? Thanks. Landon
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Tom from SWISCO responded:
Thank you for posting! I'm afraid this operator has been discontinued for some time and is no longer available. You could possibly substitute with our 39-013 and 39-014, but we cannot guarantee that they will work. We have never been able to find anything closer.
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