Looking for a wiring harness that convers our 12 pin radio connectors to 21 pin type

["Turbo-T"]

Before I buy new I thought I'd see if anyone has one they want to sell. It would be Metra p/n 70-1853. It plugs into the rear of a 21 pin radio and converts it over to be used on a 12 pin set up like all G bodies have.

Thanks.