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Thanks for reaching out to us. This part looks very similar to our 39-248 Roto operator base. However you said you needed a complete assembly. Does that mean you need the operator and everything else? If so, then I'm afraid I can't make a recommendation based on just the base alone. I would need more of a reference to recommend anything else. 

Do you have another window in the house that might still have all its hardware? If so, we can use the hardware there to determine a match.

Alternate view with measurements