Judging by the sliding side door, this was made from 1972-74.

Remember that flashback on the episode of "New Girl" where Jess was approached by a sleazy looking guy in a van as a kid, and it turned out to be legitimate?

https://www.youtube.com/watch?v=N4LZCyUg6IU

BTW, I know somebody who actually put tailfins on a Pontiac Astre.