The Bolt-wash.,6x16 is the cheapest item from this partsfiche.
A sample from the products for the Windshield Washer include: Clip, Tube 7mm, Bulk,vt-bh3,07x8m, Bulk,vt-bh3,07x8m, Motor Washer.
In this schematic the "Bolt-wash.,6x16" is used most often.