I have a 1969 post window chevelle I need to know if there's anyone know if there any different in post window and non post window chevelle quarter panels

Don't know for sure, but if there is a difference it would be very minor around where the rear quarter window post is. The roof line and rear lower quarter glass lines are the same.

By the way, welcome to Team Chevelle - you'll love it here graemlins/waving.gif