The five Er650hjf Z650 2018 Europe,middle East,africa Accessory(pannier) component parts are all listed in this schematic.
With two applications this Bolt-flanged,8x30 is the most specified part.
Some items from this specific schematic: Pannier Set (soft-lug, Bolt-flanged,8x40, Collar,8.5x16x2.3, Bracket For Panniers.