Andersen casement operator

A home owner from Massachusetts says:
I wonder if you have replacement parts for these Andersen casement operators. The house was built in 1974. Thanks!
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Bob from SWISCO responded:

These are old Andersen operators that are no longer made, but you might be able to replace this with our 39-366 , as well as the 39-504 track. Take a look and see what you think. 

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