On this parts fiche the Clamp is the most specified component.
Some items from this specific schematic: Clamp, Washer, Bolt, Screw.
The most reasonably priced component used on the Dr250s 1984 (e) (e01 E02 E04 E6 E18 E21 E22 E24 E25 E39) Air Cleaner is the Washer,lock.