Keeper for Legacy Handle Set

Can you show us your door's internal mortise lock? That would determine the possible keepers you can use. Thanks.

Forgive me, but I actually am not certain what you mean by striker plate; in our terminology, keeper and striker are somewhat interchangeable, at least when it comes to patio doors. Can you tell me what the striker plate does, or if you still have your old one, show me a picture? 

As far as the keeper goes, your door has what looks like our 82-227 Mortise Lock. There's a few different keepers that can work with this. Start by looking at our 89-020, 89-021, or 89-021D.