Item Photo: No. 1 in the diagram. Assembly items (includes items 2 thru 18) 2• Top Cap (1) 3 • Nut (3) 4 • Mounting Plate (1) 5 • Light Block (1) 6 • Rolled Spacer (3) 7 • Heat Sink (1) 8 • Screw (3) 9 • Quartz Halogen Bulb (100 Watt) - 24V (1) 10 • Screw (2) 11 • Lockwasher (2) 12 • Bulb Socket (1) 13 • Silicone / Fiberglass Sleeving 8.5" 14 • Screw (3) 15 • Lockwasher (3) 16 • Rolled Spacer (3) 17 • O-ring (3) 18 • Screw (3)