These parts are not in the current pack, unfortunately! It is one of the oldest packs from Screaming Brain Studios, so I am actually working on a revamped/updated version of the entire pack, that should come out sometime this year! It will contain floors, ceilings, and backgrounds matching the style of those in the article, as well as an updated version of the tutorial related to how to create these types of floors and ceiling tiles yourself! I apologize for any confusion!