Installation instruction is not included, professional installation is highly recommended. Wiring may be required if tail lights come with LED or Halo. Unique design by experienced manufacture for ultimate upgrade. Your questions will be replied accordingly.The return items must be in their original condition and no signs of being installed or used, and free of scratches. Please send back with original box. The item "New 03-06 Silverado Black LED Tail Brake Lights Left & Right Set" is in sale since Thursday, October 8, 2015. This item is in the category "eBay Motors\Parts & Accessories\Car & Truck Parts\Lighting & Lamps\Tail Lights". The seller is "ckw1228" and is located in Los Angeles, CA. This item can be shipped worldwide.