Hi Neil, of course you are correct, sorry. I got myself confused. I now realise that the 56C & 76C both would be identical from the windscreen back.
Sorry, I'm a slow learner!😩
An extra question. Would it be fair to say that to compare a 1941 model 44 (A-body - as in my Series-A Special Business Coupe), with a 1941 76S (C-body Roadmaster Sport Coupe), there would be no 2 panels on the car that are the same, also the chassis, engine & transmission are also different, even though they are both 1941 Buicks? If so I find this astounding!