So I’m helping my friend sell his early production 1968 Coronet and it was built the first month of the start of the product line in 1967. Been asked multiple times for broadcast sheet, but searching the car has tuned up nothing. The seats were recovered back in 1980’s, so it would have been found then if it was in the car. My question is, when was the first month/year that they started to put broadcast sheets in cars? Also, if there anything out there on early production cars like this? The vin tag shows it was pretty early build.