I see no reason why a tall person would not fit in a Mazda B2000 because the seat can be slid back. If the person is extra tall, perhaps an extended cab would be best because the seats will slide back further than in a standard cab.
The height of the 2009 Mazda MAZDA6 is 4 ft. 9.9 in. (57.9 in.).
The height of the 2008 Mazda MAZDA6 is 4 ft. 8.7 in. (56.7 in.).
The height of the 2013 Mazda Mazdaspeed3 is 4 ft. 9.5 in. (57.5 in.).
The height of the 2007 Mazda MAZDA3 is 4 ft. 9.7 in. (57.7 in.).
The height of the 2014 Mazda MAZDA3 is 4 ft. 9.3 in. (57.3 in.).
The height of the 2005 Mazda MAZDA3 is 4 ft. 9.7 in. (57.7 in.).
The height of the 2005 Mazda MAZDA6 is 4 ft. 8.7 in. (56.7 in.).
The height of the 2006 Mazda MAZDA6 is 4 ft. 8.7 in. (56.7 in.).
The height of the 2008 Mazda MAZDA5 is 5 ft. 4.2 in. (64.2 in.).
The height of the 2008 Mazda MAZDA3 is 4 ft. 9.7 in. (57.7 in.).
The height of the 2004 Mazda MAZDA6 is 4 ft. 8.7 in. (56.7 in.).
The height of the 2009 Mazda MAZDA3 is 4 ft. 9.7 in. (57.7 in.).