KALLAX Shelf unit with 4 inserts, white, 577/8x441/8" - IKEA
Kallax Dimensions (Assembly Issue) : r/IKEA
KALLAX Shelf unit, black-brown, 16 1/2x57 7/8" - IKEA
For those interested, Ikea has launched this Kallax variant with Vinyl enthusiasts/DJ in mind, it's called "Obegränsad" what do you think? price is 120€ : r/VGMvinyl