I have a 66 Mustang coupe with the red interior. I want to switch over to the 67 "saddle" color upholstery and I was wondering if the upholstery would be a direct fit or what it would take to make this work out for me. I haven't been able to find any info on it at all and I hate to order anything just to find out it was futile! I know the front seats would need the 67 foams but I'm not sure about the rear seat.