In 1963, a front-engine bus chassis was unveiled, based on the LP 321 lorry. New versions of this chassis as well as new versions of the O 321 integral bus were presented the following year. The first integral bus tailored to the Brazilian market was the O 326, a rear-engine coach unveiled in 1966. It featured the turbo-charged OM 326 engine delivering up to 200 hp. One year later, a new front-engine bus chassis was also unveiled – the LPO 344, also based on a lorry chassis.