Check out any of the twenty Seat (vl800l4 E03) components enlisted.
A sample from the products for the Seat (vl800l4 E03) include: Spacer(6.5x10x11), Washer(6.5x20x1.6), Washer(6.5x24x1.6), Cushion,seat Bracket.
On this parts fiche the Cushion,seat(40x20x15) is the most specified component.