hi guys.I need some advice please.i have an a5 s-line Sportback 2013 and have half leather heated electric seats and 3 rear headrests so its a 5 seater model.im thinking of changing the seats to full leather s5 or rs5.i understand the door cards would be different as a coupe and Sportback won't fit but would the seats fit.will they fold down like they do on the Sportback model. and can I fit the middle headrest and the middle seatbelt and isofix fittings.also would the newer model a5 as in the latest model coupe seats fit my car.any help would be great.cheers