Parts such as the Steering Stem (model E): Bolt 8x50, Bolt 12x45, Screw, Bolt are included in the Dr250s 1984 (e) (e01 E02 E04 E6 E18 E21 E22 E24 E25 E39) Steering Stem (model E) parts fiche.
With four applications this Lock Washer is the most specified part.