Sliding Glass Patio Door Latch Keeper

Thanks for reaching out to us. Most New Castle patio door locking mechanisms look like our 82-238 double hook mortise lock. If so, this lock is compatible with the 89-030 Multi-Point Striker and the 89-036 Two-Point Adjustable Striker. I would need photos of the hardware in question to confirm. Take a look at the dimensions for both of these keepers to confirm which of them is the right fit for your door.

The 89-030 is indeed compatible with the mortise lock shown in your photos. You can place an order for this part right on our website at your convenience.