Viwinco sliding door handle with key lock

Thanks for posting! We are unfamiliar with the Viwinco name, unfortunately.

Assuming the hole spacing is truly 3-15/16" then our 82-030 and 82-310 is a good place to start. However this is just a guess. To make the most accurate recommendation, photos of the handle and mortise would allow me to confirm.

Hole center dimensions for 82-030

Thanks for the photos, they help a great deal to recommend the most accurate replacement. Carefully review and compare your handle set to our 82-081. This set has a 4-15/16" installation hole measurement so I would be absolutely sure to double check that measurement, especially. The handle set comes with a key lock and a compatible set of keys.

Dimensions for 82-081

The compatible mortise lock and keeper are parts 82-238 and 82-030. I am confident that these are the parts are what you will need, however, I do recommend confirming the measurements to be sure.

Alternate image for 82-238

Alternate image for 89-030