I bought and installed the following solution from Jumbo today.
1 pack / Qualité & Prix threaded bolts | M6 × 40 mm | 6 pieces | Art. 3.809.659
1 pack / Qualité & Prix threaded sleeves | M6 × 20 mm | 4 pieces | Art.3.809.488
Please ensure that the threaded sleeve with its diameter of 10 mm fits through the hole in your toilet (usually a hole of 15 mm).

Hi, I bought the long screw kit for the Laufen lid from nettoshop.

Unfortunately there are no spare parts, so you have to order another model.