The most reasonably priced component used on the Ew50 2003 5wk1 Holland 1b5wk-300f1 Seat is the Bolt, Washer Based.
seventeen components are shown in this Ew50 2003 5wk1 Holland 1b5wk-300f1 Seat exploded diagram.
A sample from the products for the Seat include: Nut, Spring, Pipe,over Flow, Cover, Seat, O/m Ew50 'slider' Dutch '03.