Having owned mine since '69 and drove it as the daily driver for the first 13 years, I've had five in the car many times. The center rear offers a place for knees that the sides don't but the ride on the hump is terrible the way the seat is designed. I always hated to have that many in the car because the original stock springs coupled with the low stance caused a lot of bottoming. I know why the pinion and axle bumpers were designed into the car.