Cathy, this medicine cabinet is actually manufactured through the cabinetry line Dura Supreme. It was achieved by reducing the depth of an already standard 15" wide wall cabinet.
Suggestions are to look within your vanity cabinetry line or hire a finish carpenter to build them per your specifications of the space. Keep in mind, the depth of the pictured wall cabinets abbove, are going to be the same as a "non-recessed medicine cabinet" you will find anywhere (approx. 4"D). Through research I am sure the width can be achieved like in the link below.

http://www.nutone.com/products/product/fcd80b61-ee5c-4ccb-8046-3e8013356bec
http://www.robern.com/product/collection/index.rbn

Thanks for inquiring and good luck in your search.

Ashley Avery