Need new part

A home owner from Kitchen says:
Sliding door keeper broke on one side. I flipped and figured it would still lock but isn't locking every time. Need new part. Which would work? Should I just get both and try both? Would I ever need to replace the actual hook part as well that latches in?
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Casey from SWISCO responded:

Hello,

I would recommend starting by comparing the dimensions of our 89-020 and 89-021D to yours. If you need the mortise lock as well, feel free to send us a photo of that as well. Thank you!

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