1988 1989 1990 1991 1992 1993 1994 - Chevy, GMC & Cadillac Non-EQ Receiver Box Upgraded with iPod Aux Input for use withyour iPod, iPad, iPhone, Android, mp3 Player, Satellite Radio and much more! - These vehicles used both EQ and non-EQ versions of this receiver box and will only work with the non-EQ system. Please check other listings for the receiver box that is designed for the non-EQ system. If you're unsure which you require, please contact seller with fitment or function questions. This receiver box has been upgraded with an aux input so you can listen to your 3.5 mm music device in crisp, clear quality. Forget those shoddy FM modulators and upgrade today!