[leddzepp]

Looks like it was dealer installed, or aftermarket. It is not factory GM. It has no bearing on the parts you need for the factory unit. If you had a factory set-up, it would be worth it to fix it up, but if you are starting from scratch, I would go with classic auto air, or vintage air for a system, because factory stuff is expensive and you have to collect it piece by piece unless you find someone else selling a complete set up