LED Fairing Light Spacer/Wire Guide, Bulk pack 49501-3,Bi-Voltage System for 12-volt and 24-volt systems,Designed for extended installation and wire routing,Durable construction with cast aluminum housing & polycarbonate lens,Includes gasket for Surface Mounting or Spacer/Wire Guide,Increases trailer perimeter lighting,Install with two #8 fasteners (not included),Low, contoured design minimizes chances of external impact damage,To be used when surface mounting the lamp