How do you adjust the vent window frame

Dana67Dart said
I thought the convertible vent frame was different from non convert. It is flat at the top vs more pointed? I have been wrong before!

Early models were different. hardtops and barracudas were pointy, convertibles were flat both these are 66 , barracuda on left, dart convertible on right. 67 and up looked the same to me, But I don't have a hardtop or convertible near me to double check