From the trusted manufacturers at General Motors, this OEM Radio Amplifier Stereo amp is specifically designed for the Cadillac STS. With interchangeable part numbers 25810311, 25865074, and 25954814, the Gm289U is a high-quality product that delivers on both quality and longevity. Upgrade your stereo system with this reliable Cadillac STS S-T-S Radio Amplifier Stereo Amp BOSE Sound System.