More 28+ Closetmaid Extra Shelves. The extra shelf coordinates with tall cabinet model 12281 and. Shop for closetmaid shelving in storage & organization at walmart and save. Install shelving tough enough for the garage. We're interested in your organization ideas. Closetmaid Extra Shelves - Customclosetmaid Shop for closetmaid shelving in storage & organization at walmart and save. Install shelving tough enough for the garage. 6 feet long by 1 foot wide by 5/8 inch thick.