Here is a picture of the underside of the rear bench seat. It was advertised as coming from a 1960 4 door Chevrolet Impala or belair. But it’s SMALLER then my blue one. Someone please help me to identify what year and model this comes from. Someone suggested that because it was more narrow, then it could be from a CONVERTIBLE. But convertibles have that SPEAKER PLATE in the middle. I just don’t know.