In 1952 Bill Buckle Jr. traveled to England and found fibrelass-bodied sports cars being manufactured and a plastic sports car body at the 1953 London Motor Show. Upon his return, Buckle persuaded the company's other directors to construct a unique fibreglass-bodied sports car. With development lasting through 1945 and 1955, a prototype roadster was finally created in mid 1955 using Ford Zephyr components. After testing and minor design changes, the finished vehicle was first manufactured in June 1957 as the Buckle 2.5 Litre in a factory in Punchbowl, New South Wales. The coupe proved successful in racing however only around 25 were made.
In the late 1950s, Buckle realised that Australia's import taxes could be substantially reduced if a chassis was imported instead of a complete vehicle. In 1958 Buckle traveled to Dingolfing, Bavaria to discuss the manufacture of Goggomobil vehicles in Australia with Hans Glas. An agreement was reached in which the chassis, engine and running gear would be imported and the body would be manufactured in Australia at the Punchbowl factory. A few whole vehicles were initially imported to make fibreglass moulds from. The Buckle Goggomobils were almost identical to their German counterparts with the exception of Buckle's Goggomobil Transporter being more rounded. Thousands of Goggomobils were produced by Buckle Motors. At this time the company also began to sell Borgward, Goliath, Lloyd-Hartnett, Hillman and Humber vehicles.
From 1959 to 1961 Buckle Motors also produced the original fibreglass-bodies Goggomobil Dart two-seater sport car bassed on the Goggomobil Coupe. Originally doorless with a 293cc engine, later models featured small suicide doors, a hardtop and a 400cc engine. Nowadays the Goggomobil Dart remains as an iconic Australian vehicle
In 1961 Buckle Motors was purchased by Hong Kong investors and in 1963 Bill Buckle created Bill Buckle Auto Conversions, specialising in left-hand-drive to right-hand-drive conversions of American vehicles.