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.
Selling top part only) IKEA Billy Bookcase Shelf Extension only no Lights, Furniture & Home Living, Furniture, Shelves, Cabinets & Racks on Carousell
BILLY Bookcase with height extension unit, white stained oak veneer, 40x28x237 cm - IKEA Spain
BILLY Bookcase with height extension unit, white, 80x40x237 cm - IKEA Spain
Ikea Billy Bookcase Extension Unit, White – Nordic Chill
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Billy Bookcase, Easy to Assemble – Between Naps on the Porch
BILLY Bookcase with height extension unit, white stained oak veneer, 80x28x237 cm - IKEA Spain
Billy Bookcase, Easy to Assemble – Between Naps on the Porch
BILLY Bookcase with height extension unit birch veneer, white - IKEAPEDIA
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BILLY - Bookcase with height extension unit, white stained oak veneer
BILLY Height extension unit, white, 80x28x35 cm - IKEA Spain
Billy height extensions stacked. : r/ikeahacks
BILLY / OXBERG Bookcase+height extension & doors, white, 160x30x237 cm (63x113/4x931/4") - IKEA CA | Billy oxberg, Bücherregaltür, Bücherschrank mit glastüren