This American International SA41069GM speaker adapter is designed to allow you to connect 6"x9" speakers in the rear shelf where the factory installed 4"x10" . It is compatible with a variety of 1978-1988 g-body models and is made with high-quality nylon to ensure a secure and reliable connection. With its oval shape and compact size, this speaker adapter is perfect for those who want to upgrade their in-car entertainment system. It is easy to install and use, and is a great addition to any car. Whether you're looking to replace a damaged speaker adapter or simply want to upgrade your sound system, this American International SA41069GM speaker adapter is the perfect choice.