Simply return in the original packaging if there is an issue. Upgrade CD drive to read burned CDs, cleaned, etc.
I do sell adapter wire harness in my store for 80's GM cars. The item "Delco CD Player Radio GM Firebird Bonneville Grand Prix Pontiac 5 EQ Equalizer" is in sale since Tuesday, October 27, 2020.
This item is in the category "eBay Motors\Parts & Accessories\In-Car Technology, GPS & Security\In-Car Entertainment\Car Stereos & Head Units". The seller is "thedealman13" and is located in Rowlett, Texas. This item can be shipped to United States.