I am trying to identify these 2 heater core cases. The rustier one has a 69 Firebird convertible tag on it but the other one does not. Am help would be greatly appreciated!

Thanks!

Eddie

So it is kind of hard to tell by the picture, but it looks like the difference between the two are the rotating item on the left side almost to the end? If so the black one looks to be a 67-68 firebird heater. I attached a pic for a 67-68 heater.