How about every station wagon that's been made by grafting the rear roof onto a sedan without altering the roofline of the original car? AMC did that with some of their Ramblers and other companies have done the same. Some Volvos put a straight roof on the wagons but instead of making wagon specific rear doors they have a little filler piece welded in above the top rear of the window frame.
http://oldcarandtruckpictures.com/Am...ionWagon-2.jpg