Replacement parts for older casement windows

Thanks for reaching out! We do not have an exact replacement match for your casement window operator but I do believe we may have a few options that could work as a suitable alternative. 

May I see a clearer photo of how the base of the operator is mounted to the sill? I am looking to see the shape of the base as well as the installation hole patterns.

Please don't hesitate to reach out with any questions you might have.