Parts such as the Rear Swinging Arm: Bearing(17x40x13.25), Nut, Cushion, Nut are included in the Vl800t Boulevard C50 2007 (k7) Usa California (e03 E33) Rear Swinging Arm parts fiche.
Of all the components that make up this Rear Swinging Arm the Bolt(6x20) has the lowest price.
In this schematic the "Bolt(6x20)" is used most often.