Patio door latch

Hello,

I can't be sure without seeing the front of the latch but I suspect that you could use something like the 82-218 mortise lock. Take a look and see how the specifications compare to yours. Unfortunately, we do not carry a replacement for the fave plate housing that your mortise is attached to in your photos. As long as it's still in good condition, you should be able to reuse it with a new lock assembly. Thank you!