Trying to find a sliding glass door handle backplate

A quick learner from San Jose, CA says:
As you can see it look slike I have a Mortise style reversible handle. The handles and lock mechanism work just fine. The issue I am having is this metal back plane where 2 machine screws attach the outside handle via the sliding glass door. The screws will not hold it anymore and just go right through, thus the handle stays on. Is there a replacement part for the 4 15/16" metal black plate on the right (not the handle that i am holding). Thanks

The markings say Made in New Zealand.

User submitted photos of a sliding door handle.
Profile picture of Tom
Tom from SWISCO responded:
Good afternoon, and thanks for posting, Chris. Please look at our 82-068 Mortise Style Handle Set. Compare the measurements and let us know if they differ in any way.
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