Name of Ikea sofa bed sought

Hello, I bought a sofa at Ikea in the year 2000, which can also be used for sleeping. The side and backrests can be pulled out from the sofa. The back and side cushions are simply loosely placed. The covers of the sofa, the cushions, as well as the side and backrests are removable and washable. However, I no longer know what the sofa was called. On the underside of the sofa, I only found one number: 000.371.45. Can someone tell me what the sofa is called? I want to buy or have new covers made for it. Thank you in advance for your help

I also have a question about sofas, does anyone know an alternative to this Kiplar or whatever it's called? The cheap sofa for around 100€. Unfortunately, it's ugly, but my wife really wants one that size. Now I'm looking for an alternative to talk her out of it.

Do you mean KLIPPAN? Klippan is great. It looks the best of all. Take a look at Söderhamn, that is ugly. Let your wife handle it.