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Suitable model: Compatible with Silverado 1500 2500 3500 2500HD 2001-2019, Avalanche 1500 2002-2006, Express 2500 2008-2017, Suburban 1500 2000-2014, Colorado 2008-2019, please refer to the product description for more models Part Number: 55774. Please carefully check the picture to ensure you buy the correct product Construction: Our 7-way and 4-way flatbed trailer wiring harness plug kits are made of high-strength ABS plastic, enhancing practicality. There is a layer of structure on the outside to protect the wiring, ensuring good performance throughout all your towing using Easy Installation: Our 7-way and 4-way flatbed trailer wiring harness plug kits can be directly inserted into the sockets of your vehicle without the need for cutting or splicing. The necessary installation brackets and hardware enable you to install them quickly. We attach installation instructions for your reference Note: Please confirm the car model when purchasing to avoid the issue of product mismatch caused by purchasing incorrectly