Inside systems for door handle

Hello, thank you for posting,

It appears that you are in need of a new mortise lock. Please start by reviewing the style and dimensions of the 82-239 to see how it compares to your original. If you are in need of a new lock face plate as well, review the 82-265 that is the same lock body as the 82-239, but comes with the face plate attached. 

Let us know what you think and if you have any additional questions.