The 1999-2006 GMC Sierra, Chevy Silverado/Tahoe ECM Cover and Mounting Bracket is a factory/OEM engine control unit (ECU) designed for easy installation on the front of compatible vehicles. Made of plastic, this bolt-on mounting bracket provides a secure and stable connection for the ECM cover. With a weight of 3 lbs, this product is a straightforward replacement part that does not require any modifications for universal fitment.