The Metra WM-GM3A aftermarket radio wire harness and antenna adapter is used to connect an aftermarket radio to the OEM radio harness in select 1988-2005 General Motors models. It is a high-quality harness that is easy to install and provides a secure and reliable connection. The WM-IM1 is color-coded to match the factory wiring, so you can easily identify the correct wires to connect. It also includes a power and ground wire, so you don't need to splice into the factory wiring. Overall, the Metra WM-IM1 aftermarket radio wire harness is a good choice for anyone who wants to upgrade their factory radio to an aftermarket radio. We at Metra always strive to listen to our customers. You have told us to do a better job at telling the Metra story. For over 70 years, Metra has maintained its cutting edge by paying attention to our marketplace and innovating products to meet the needs of installers. We are the "Installer's Choice" because we are installers.