I'm thinking seriously about buying my first Tesla and excited about the idea. However I have a bad back and pretty wide rear end and the wings on the seats cramp me and create some back pain that I can't live with. I read on a Model 3 thread that there are there are different generations of seats for the Model 3. Is that true with the Model S as well? Is there a model year that has flatter seats and could I potentially swap older seats into a new car (my salesperson wasn't helpful with this)?