Hello,
We'd be happy to help but we'll need a bit more information to get started. If you could write out the exact distance between the installation hole centers of your lock, that would help us narrow down your options. Thank you!
Unforutnately, we could not locate your lock through any of our suppliers. We do carry a few options worth considering, such as the 90-318. With that being said, it does not come in the same finish as yours and the mounting holes are 2-1/16" apart. Do you happen to know the manufacturer of the window? That might help us confirm if a closer match is available.
If the windows are Renewal by Andersen, you would need to contact them directly since we are only able to supply genuine Andersen parts. We apologize for the inconvenience.