Searching for Patio lock whit 3 hole

Hello,

I can't be sure without seeing the original hardware but the cutout where your mortise lock installs looks like it may accommodate something like the 82-260. Take a look and compare the dimensions below to your door specifications. We also offer the 82-249 keeper for this mortise lock. 

Alternate image for 82-260

Alternate view of 82-260

Alternate image for 82-249

We also offer the 82-030, whcih is commonly used with this type of mortise lock but you would need to determine if the 3-15/16" mounting holes match the holes in your door. If you decide to give these parts a try and run into any problems, our return policy can be found here. Thank you. 

Hole center dimensions for 82-030