Patio door catch

Thanks for your post! There is a chance we may be able to provide you with a replacement recommendation for this door keeper. Although, it does not appear we have an exact match for it. 

May I see a photo of the mortise lock it interacts with?

Thanks for the additional photos. Your mortise lock reminds me of either the 82-211 or 82-214B Mortise Latch & Keeper sets. To determine which of these is the correct fit for your door, you'll need to carefully compare each of their dimensions.

The keepers are not sold separately from either of these sets.

Alternate image for 82-211

Dimensions for the 82-214B lock and its keeper