sliding glass door lock

A home owner from Billings Mt says:
August 20, 2016
we need the replacement locking part for our sliding patio door. Measures 3 1/4in from the knob to the end, or 2 3/4in excluding the knob. The width is 1 1/4in. There are no markings and the door is almost 30 years old. Any help would be appreciated.. Loretta
User submitted a photo of door hardware.
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Tom from SWISCO responded:
August 23, 2016
Hey, Loretta. I'm afraid we don't have this exact lock. Can you confirm your measurements? We carry three in a similar style to this, but they don't appear to be the same size. I've made a list on the right side of this page. Look them over and see what you think.
Offset Key Cylinder with Thumbturn
Offset Key Cylinder with Thumbturn
40-129
$39.28
Key Tumbler Thumbturn
Key Tumbler Thumbturn
40-089
$27.15
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