The eighteen En450a2 Ltd450 1986 Europe Uk Fr Fg It Nr St / Liquid Cooled Swingarm/shock Absorber component parts are all listed in this schematic.
The Washer,10.5x22x1.6 is the cheapest item from this partsfiche.
A sample from the products for the Swingarm/shock Absorber include: Boot,chain Adjuster B, Oil Seal,mha22284, Nut,14mm, Sleeve,swing Arm.