ground. Production was 122 in 1958, 648 in 1959 and 354 in 1960. 150A The 1961 model incorporated enough changes to justify a suffix letter and thus was designated the "150A". The most obvious change was in the rear side windows, which were 15% larger for slightly better rear visibility. The landing gear was also redesigned, shifting the main wheels aft by , but not changing the gear leg mountings. This shift of the main wheels made the aircraft less likely to tip back onto its tail during loading, and it also made the nose wheel bear more weight, which increased its steering effectiveness. Other new features in the 150A were an instrument panel with a completely redesigned layout; flush inside door handles and nearly flush window latches, which made the 150's narrow cabin a bit less cramped; and an option for individually adjustable seats. 344 of the 150A were constructed. 150B The 150B was the 1962 model. It replaced the former standard propeller, the Sensenich M69CK-52, with the McCauley 1A100/MCM6950. The new propeller had the same diameter of , but its blade pitch was reduced, which increased the maximum cruise speed by about and slightly improved the climb rate and service ceiling. The original metal wingtips were replaced by more smoothly contoured fiberglass ones with a different shape, increasing the wingspan by about . The optional two-passenger child seat for the baggage compartment, available from the very first 150, was completely redesigned for the 150B. A new option was a simple autopilot, specifically for the Commuter version, called "Nav-O-Matic", a single-axis heading-hold type. Also newly offered for the 150B were optional "courtesy lights" in the underside of the wings to light the area around the doors when on the ground. The "Patroller" message drop tube option, on the other hand, was eliminated. 331 "B" models were built. The Commuter version cost US$8,995. 150C The 1963 model, the 150C, added a quick drain to the fuel strainer, and it offered an option for larger 6.00×6 inch (150×150 mm) main wheels and tires to replace the standard 5.00×5 inch (125×125 mm) size. Also, the optional landing gear "speed fairings" were changed to a sharp-nosed design compatible with those used for other single-engine Cessna models. 472 of the 150C were completed. 150D The 150D model for 1964 brought the first major change to the 150's look—the introduction of a wraparound rear window