Sliding Door Lock/ Handle

A home owner from Arizona says:
On the handle it has the following markings.

Canadian Patent No 919213
Patented 1975
Pat No. 3596954

I am trying to get it replaced and not having any luck.
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Casey from SWISCO responded:

Hello,

Take a look and compare the dimensions of our 82-033 handle set, as well as the 82-211 and 82-214 mortise latches, to your original hardware. Thanks for posting! 

How to install the Swisco 82-033 Handle Set
How to install the Swisco 82-033 Handle Set
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How to maintain a sliding glass door
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