Ikea metal bed gold/white: ball nut missing

Hello dear Ikea community,

I bought a bed second-hand, among other things. Unfortunately, after the purchase, I realized that a "ball nut" was missing. To get this spare part, I need the name of the bed in order to look for the assembly instructions and find out the article number.

Thank you in advance!
Best regards, André

SORRENTO The chances are slim. The bed is over 20 years old.