Request for help with hardware replacment

We unfortunately don't sell this style handle. Your mortise lock could be our 82-211, but but I would need to see it out of the door to confirm.

Now, the 82-211 mortise is compatible with our 82-087 handle set, but the design of the 82-087 is so different from your original that I can't be sure it will install properly on your door. In a worst case scenario you will have to drill new holes, but even then it's not a guarantee. Look it over and see if you think it's something you could get working on your door frame.

That's a huge help, thank you! So, your mortise here has a 45 degree slot for the thumb lever and key tails. These tails both insert into this slot from the inside and outside and they both have to be at that exact angle.

So, that's the good news. That means that on paper, our 82-087 handle set will technically be compatible with your mortise lock. The trouble now is how much of a hassle it will be to mount it to the door itself. Your hole spacing almost certainly isn't going to be similar, so you will need to drill new holes for the 82-087 to mount. That also means you need to find a way to take that mortise lock off first so that you don't accidentally drill into that.

Personally, I think you may want to consider our 82-030 handle set, instead. This is more or less the same thing as the 82-087, it's just a little more flexible since it has an adjustable thumb lever. That means you have a lot more leeway in terms of where it mounts to the door, which is something you might need. The catch is that it's not available in metallic finishes. It also doesn't come with a key lock, but you can purchase our 82-310 separately and use that.

It's ultimately up to you. I still can't guarantee that any of our handles will work, since they're so different, but at the very least I can tell you that they'll be compatible with your old mortise lock. That's half the fight right there, so I'm optimistic. Look over the parts I mentioned and see what you think!