Daimler buses were fitted with proprietary diesel engines, the majority by the Gardner company, of Eccles, Lancashire, although there were a few hundred Daimler diesels built in the 1940s & 1950s, and the Leyland O.680 was offered as an option on the Fleetline (designated CRL6) after the merger with Leyland. The bus chassis were also fitted with bodywork built by various outside contractors, as is standard in the British bus industry, so, at a casual glance, there is no real identifying feature of a Daimler bus, apart from the badges (Front engined Daimler buses retained the distinctive fluted radiator grille top). The last Daimler Fleetline was built at the traditional Daimler factory in Radford, Coventry, in 1973.