In answer to my own question for the benefit of others:
I had the work done by a professional installer and this is how he did it. First, he used a hammer drill to get through the thin coat of stucco. When he reached the metal part of the lintal he used a self-tapping metal screw to create a hole through the metal to the concrete core. Then, he took out the screw and finished off with a hammer drill and used a Tapcon screw to attach the brackets.
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