replacement patio door handle set
The unit appears to be a Guardian slider about 19-20 years old. Here are the picts and dimensions looks like holes on center are 4 inches. Thanks for your assistance.
Hello! We can definitely help you with this hardware. It looks like you need a new handle set, mortise lock, and keeper. For these I recommend our 82-035, 82-229, and 89-021D respectively. I think these parts look very similar to your photos but it would be a good idea to review them just in case.
You also mentioned security. You could install the 82-315 on the outer handle that comes in the 82-035 set. The video below shows you exactly how this can be done. We also sell the 80-006 security bar, which can give you a little extra something.
Oh sure, I'm sorry for missing that part. We have the 82-087, however it's important to note that the thumb lever is fixed in an offset position and cannot be adjusted. If your thumb lever was centered while installed, then the 82-087 will not work.
However if your thumb lever happened to also be offset then this handle set would work very well for your door.