Pella sliding door parts

It's tough to tell what you have from these photos. It looks like your mortise lock is covered with some kind of nylon cover. Would you be able to remove that cover and the mortise lock and show us a picture of the lock by itself? In the meantime, see our 82-218. This may be what you have, but this is just an educated guess.

For the keeper, see our 89-029. This is also compatible with the 82-218, which may lend credence to my guess.