AMC Matador coupe NASCAR Barcelona II and the 1975 AMC Matador “X”

 

In racing conditions, these open Opera windows significantly improved airflow, giving the vehicle's aerodynamics better lift in the race.

https://gtosupersport.blogspot.com/2017/07/que-es-una-ventana-opera.html

https://www.gatsbyonline.com/automobile/1975-amc-matador-coupe-x-la-fin-d-une-grande-epoque-345096/