The toilet seat from the middle class (?) - Brand manufacturers Santiop-Wingenroth (available at the hardware store) is really good. For around 33 euros, it has a sound quality and a good fit. Installation is simple. To insert the screws into the holes of the toilet you should hold the seat vertically, then fit the screws in the openings. The seat can be tightened well and an antibacterial finish has the Duraplast also. 10-year guarantee for spare parts, the manufacturer. A good buy.