Can anyone verify if the 66 bucket seat upholstery bottoms have listing panels near the scroll work trim that fasten down to the springs creating a mild bolster? If so, I'm suspecting that who ever installed my seat covers before I bought the car might have skipped that part of the installation. They are Legendary covers but the seat bottoms are basically flat which makes me suspicious. I’m installing new upholstery in my 67 and I’m wondering if I need to re-do the 66 seats next to correct.