Power seat is rare. A/C in a 'vert is strangely common in Michigan cars. Fold down seat isn't common, but isn't rare either. Power windows are less common than fold down seat, but not "rare". Finding a car that has all the options above is rare.
There is a key buzzer, but mine doesn't buzz with the light switch position, only if you leave the key in and open the door.
Did you get the GTO and LeMans too?
Vikki 1969 Goldenrod Yellow / black 400 convertible numbers matching