I presume Jim you are refering to the narrow door non Q type.
These cabs were known as 'fully weather-clad'. They were available as just the bare frame, (un-clad) built up with the windscreen panel and a red canvas sides, (with acetate windows) roof and rear roll-up window clip-down panel, all as one 'cover' that was called 'weather-clad or full metal cladding with black plastic/propolene roof known as 'full metal-clad'. The early ones were coloquially called 'high-cab' and the designation/serial plate fixed to them had the models they were to fit stamped in them and 'Harrison McGregor Guest' printed on it together with the safety approved kite mark.