Rear view out the inside rear view mirror is a strange topic. Anyone who has put a street rollbar into a spider knows that bar takes a horizonal slice out of the rear view. My newly acquired 90 Miata has an old top and the plastic rear window is so bad, even after polishing, is fairly useless. The snorkel takes a vertical center slice out and thus seat height should not be an issue. Maybe I'll try to take a picture of what's seen in my rear view mirror. Or just forget what's behind you! Or even better, embrace modern tech and install a full time rear view camera.