Replacement locks for sliding glass door
Thanks for reaching out. Your existing mortise lock is very likely our 82-218. However, mounting it to the door may present you with some issues, since it appears the vinyl is totally cracked; there are aren't any holes to screw the mortise in.
There is a chance you could use our 82-227 as a replacement but it will take a bit of work. This mortise has a face plate that would extend beyond the damage and allow you to drill new mounting holes in the vinyl. I cannot make any guarantees if this will fix the issue or that the mortise lock will even fit, but this is the best option we have.
Take a look at the measurements for the 82-227 to determine if this part might work for you.