The B2000 was also available in a long-bed version with a longer wheelbase and rear overhang, which was given the model name "Sundowner" in some markets—a reference to nomadic Australian herders who would make camp wherever they were at sundown. The regular model code UC11 was changed to UC21 when it was fitted with a long bed. The chassis coding system was used for the US market in 1981 when a standardized VIN code was introduced. This change led to a second coding system, complicating the identification and grouping of these trucks. The B series was reskinned during 1982, with new sheetmetal below the belt line, and was replaced in January 1985. By this time, 1.8 million Mazda B-series trucks had been built since 1961.