If you go here; http://www.carnut.com/photo/list/flist.html , select Chevrolet, then choose 1957. It will take you to a list of pictures. If you go to the right column list of 2dr sedans look at #18, that's a 150, #28 is a 210, and #20 is a Bel Air. Look closely at the trim differences it'll give you an idea. '55 and '56 were similar as they had all three models as well, and the trim was the most visible difference.