I found a replacement patio door 6 5/8" handle on your site, but I do not know what the part is called that it locks into. What I have looks like a 2 3/4" plate.
Casey from SWISCO responded:
May 16, 2023
Hello,
I would recommend starting by comparing the dimensions of the 89-003 and 89-018 patio door keepers to yours. We'll include the images from our product pages below. Take a look and let us know if you have any other questions. Thank you!