![Why would there be an extension option for the tall BILLY but not the short one? I bought the extension in the clearance section, already assembled, so no hardware came with it. Why would there be an extension option for the tall BILLY but not the short one? I bought the extension in the clearance section, already assembled, so no hardware came with it.](https://i.redd.it/a8cz4plo0wz51.jpg)
Why would there be an extension option for the tall BILLY but not the short one? I bought the extension in the clearance section, already assembled, so no hardware came with it.
![DIY Billy Bookcase to Built-In: Step-by-Step Beginner's Guide | Ikea billy bookcase, Ikea furniture hacks, Furniture hacks DIY Billy Bookcase to Built-In: Step-by-Step Beginner's Guide | Ikea billy bookcase, Ikea furniture hacks, Furniture hacks](https://i.pinimg.com/originals/de/52/22/de5222be3d85da4fcf428cf6ce89932b.jpg)
DIY Billy Bookcase to Built-In: Step-by-Step Beginner's Guide | Ikea billy bookcase, Ikea furniture hacks, Furniture hacks
![Billy bookcases from IKEA, with height extensions and glass doors | Дубовые книжные шкафы, Идеи икеа, Стеклянные полки Billy bookcases from IKEA, with height extensions and glass doors | Дубовые книжные шкафы, Идеи икеа, Стеклянные полки](https://i.pinimg.com/originals/77/6b/a8/776ba88a78e3b439826032642a69cd63.jpg)