The 1956 models were similar, but had small tailfins. The Hemi V8 was enlarged to with , and a four-door Southampton hardtop sedan was added to the range. 10,268 were produced. With a wheelbase of , longer than the previous year's by , they had the longest wheelbase ever for an Imperial. This also contributed to an increase in their overall length to , making them the longest non-limousine post-WWII American cars until the advent of the Imperials of the "Fuselage Look" era later in the 1970s.