If you bought any model of the Bukobot with a duo extruder, you should have two of these.
1x Spitfire Hot End Pre-assembled Nozzle, Heater, Basemount
1x M6 x 12mm Screw
1x Cooling Fan Fan
1x Fan Spacer 4mm Lasercut Acrylic
1x Wire w/ 2 Pin Connector Thermistor Connection Wire
2x M3 x 40mm Button Head Screw
2x M3 Nut Nut