There's simply a small trim piece for the windshield. Chevelle sedans had side vent windows, which were finally eliminated in the hardtop starting in 1969. Of course, a post gives the body integrity from twisting on hard launch and acceleration. It's interesting that the sedan with vent windows necessitated different door panels. The two will not interchange, and the cheapie sedan door panels are also thinner.
Options are few.
Tinted windows were ordered to hold down cockpit temperatures in the Arizona heat. Power disc brakes were mandatory with SS 396. And the owner went so far as to special order Hugger Orange, which is a Camaro color. Researching SS 396 ordering requirements for 1969 reveals that Hugger Orange and Daytona Yellow, also a Camaro color, were available on the Chevelle if and only if the SS 396 option was first ordered. In addition, Roger Adkins received complete paper documentation with his rare Post Master Chevelle.