With a wall unit you have a through the wall, in which you need a wall sleeve or if your wall is less than 8 inches deep you can go with a slide out unit.
We use Aj Madison for our appliance needs in brooklyn on 38th street. They have a trailer outside their store stocked with air conditioners, so I am sure there is one for you.
You also need to keep voltage in mind, so I suggest you speak to a professional, lest you order the wrong thing.