Need replacement handle
Hello there!
Thank you for reaching out to us. It looks like the thumb lever here is centered though it is hard to be certain. We recommend you remove the handle and check the underside of it to confirm the lever position. If it is indeed centered, we recommend the 82-030. This part measures 3-15/16" on the installation hole centers. Take a look at the specifications and see what you think.
If the thumb lever is in an offset position, see the 82-089 handle set instead. Note that it's important to determine the position of the thumb lever first so that the lever pin will fit into the mortise hole slot accordingly.