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 fit the needs of the installer. We are the "Installer's Choice" because we are installers. We design our products to be easy to use and easy on the eyes. If you can see a Metra product, then we haven't done our job. Metra wires harnesses are designed with the same philosophy in mind. Their longer length for ease of installation and thicker OEM cables with OEM connectors make for a mighty install. When replacing the OEM radio with an aftermarket radio the aftermarket radio will not fit the OEM plug. Metra's WM-GM1 radio wire harness used to connect an after market radio to the OEM radio harness In select General Motors from 1988-2005. Harness used when replacing the oem radio. Metra Electronics WM-GM1 Radio Wire Harness: * Comes with a harness to fit a wide variety of General Motors from 1988-2005 * Plugs in the OEM radio wire harness and connects to an aftermarket radio * Provides power and ground from the OEM radio wire harness and connects to an aftermarket radio * Provides audio for 4 speakers * Follows EAI color code * Easy installation