internal sliding door lock

A home owner from arizona says:
patent no 3596954, other side says canadian patent no 919213 patented 1973 internal sliding door lock. House was built in 2005. need replacement part.
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Tom from SWISCO responded:
Would you be able to show us a picture of the hardware in question? I wasn't able to match those numbers up to anything specific. I would also like to know its measurements. Thanks!
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