![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.
![BILLY / OXBERG Bookcase+height extension & doors, white, 160x30x237 cm (63x113/4x931/4") - IKEA CA | Arredamento ingresso ikea, Arredamento casa country, Scaffale per libri BILLY / OXBERG Bookcase+height extension & doors, white, 160x30x237 cm (63x113/4x931/4") - IKEA CA | Arredamento ingresso ikea, Arredamento casa country, Scaffale per libri](https://i.pinimg.com/736x/1d/37/76/1d3776c5d60844f60553d0d22bc43c35.jpg)
BILLY / OXBERG Bookcase+height extension & doors, white, 160x30x237 cm (63x113/4x931/4") - IKEA CA | Arredamento ingresso ikea, Arredamento casa country, Scaffale per libri
![Billy bookcases from IKEA, with height extensions and glass doors | Bookcase with glass doors, Ikea billy bookcase, Billy bookcase Billy bookcases from IKEA, with height extensions and glass doors | Bookcase with glass doors, Ikea billy bookcase, Billy bookcase](https://i.pinimg.com/1200x/77/6b/a8/776ba88a78e3b439826032642a69cd63.jpg)