Exterior lock for Dorwal door

A quick learner from North Bethesda, MD says:
We have an old sliding glass door with a Dorwal handle. The door and locking mechanism still work fine, but we'd like to install an exterior key lock. The current exterior portion looks like it could have had a key lock included, but the round area where the key would go is solid. Do you have a replacement we could buy so that we can lock the door from the outside?
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Tom from SWISCO responded:

Sure! I see you were looking at our 82-055 Acorn handle set. As long as this is a match for your old handle set, then you can use our 82-055K. This is the same as the 82-055 but it comes with an exterior keyed handle.

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