Parts such as the 019 - Exhaust System: Snap Ring, Heat Guard Rear, Electric Motor, Exhaust Valve, Spacer are included in the Hypermotard939sp 2017 Usa (hypermotard 939sp) D230-00017 019 - Exhaust System parts fiche.
In this schematic the "Washer" is used most often.
forty-one components are shown in this Hypermotard939sp 2017 Usa (hypermotard 939sp) D230-00017 019 - Exhaust System exploded diagram.