Originally 200 Mercedes-Benz O305s with Galvastress Mark 1 bodywork were delivered between May 1977 and August 1978 with one built with a prototype Mark 2 body. These were followed by an order for 550 Galvastress Mark 2 bodied O305s that remains the largest bus order in Australia. These were delivered between October 1978 and November 1980. Whilst the bodies on the Mark 1s had been an effectively the existing PMC body married with a VöV front, the Mark 2s were of the VöV design with a lower roofline and two-leaf doors.