I have a 66 Four Door Sport Sedan and was wondering if rear seat coupe replacement covers fit four door rear seats. If they are different, where can I find replacements? Do I have to have it custom upholstered?

cahoy-66

The seat bottom is different, has rounded corners. The seat back is the same. One option is to buy a 2 door cover then have an upholstery shop modify it fit your seat.