On this parts fiche the Washer(6.5x24x1.6) is the most specified component.
Parts such as the Seat (vz800z): Washer(6.5x24x1.6), Cushion, Plate,seat Fr, Nut are included in the Vz800z Boulevard M50 2007 (k7) Usa California (e03 E33) Seat (vz800z) parts fiche.