In 1958, the PV544 was phased in. Subtle differences with the PV444 included the introduction of a curved one-piece windshield to replace the two panes of flat glass, larger taillights, and a ribbon-type speedometer. The 444's 3-speed manual transmission was also supplanted by a 4-speed unit in the 544. The interior was modified to accommodate 5 persons instead of 4 by increasing the width of the back seat and using thinner backrests of the front seats. This way the car could become a little roomier on the inside while keeping the same body.